Travelling with children

Travelling as a family allows experiences to be shared. It can add interest to family time together away from the pressures of work and education. You can gain different perspectives on places when travelling in a group with children. It is often easier to get to meet local people, people can be friendlier, and when picking educational experiences for children you often learn something yourself.

However, it also often means extra preparation to ensure that you can all enjoy the experiences. You have to balance the needs of everyone in the group, and try and avoid many of the additional expenses that can apply to travelling as a group. You may have to deal with bored children in airports or on long trips, extra luggage when they get tired, and some frustration when they complain after going to all the planning effort when you could have left them at home with the grandparents.

Luckily, when you return home the crisis times seem to fade, and the memories of the activities together get remembered.

Who qualifies as a child?

You know what a child is, but when travelling the definition of a child varies. Normally it is based on age. There may also be minimum or maximum weight and height restriction on some attractions for safety purposes. It is also worth noting that often the definition of a child will differ for hotels, flights and travel insurance. For example while generally we accept that someone may be considered a child up to the age of 18, travel insurance may sometimes let a child remain on a parent's travel policy well into their 20s, depending on whether they are full-time students etc.

Infants and toddlers under 2 to 6 years – often no charge.
Children under about 12 or sometimes 14 years – child rates normally apply.
Young People/Teenagers often 14 to 18 years – child rates in some cases, often there are special youth rates, otherwise the normal adult rates apply.
Young Adults 18 and up – full-time students under 26 can qualify for discounts with an International Student ID. Some discounts apply to all people under 26. In some places, this is 16 and up.

Destinations

Often you are lucky enough to be able to choose your destination or the timing of the voyage. Is the destination you think about one that you want to experience with your children, or is it a place you actually would like to visit without them? If the latter, should you wait with it until your children are a bit bigger or when they happen to be doing something else?

If this is a journey you really want to do together, then you might still consider what destinations are the best given realities, such as the distance to be travelled (and the means of transport available) and the child-friendliness of whatever environment you will have to cope with. You may want to do a trade-off between the things you want to experience with your children, and things you can experience with them without everybody getting miserable because of practical issues. If you have a baby, think about development stages – trying to get a child who just learned to walk to sit still might be a fools errand.

If you haven't been travelling together, it could be wise to choose some easy destination first, to find out what you need to do (and pack) to get things work, and to get your children used to some unfamiliar things they will need to cope with: long times seated in a vehicle, not sleeping in their own bed, lots of strangers around, unfamiliar food, what have you.

Articles on travel with children to specific destinations:

See also destination guides with dedicated sections or substantial amount of content on travelling with children: Austria, Barcelona, Mayrhofen, Paris, Vienna, Rome.

Documents

See also: Border crossing

Children's passports

Increasingly, any child, including a newborn baby, needs their own passport, rather than being able to travel on their parent's passport. Check with your local authorities in plenty of time to get a separate passport for each of your children. You may also want to allow time to check into requirements for children's passport photographs, as some countries apply the same restrictions to photos of babies as they do to photos of adults. (For example, the United Kingdom used to require that a baby had a neutral expression on its face and was looking at the camera with the color of its eyes visible—a difficult feat for newborns!)

Many countries will require that all adults who have a legal parental relationship with a child agree to a passport being issued to the child. Allow extra time for the application if you think you will have any difficulty demonstrating this.

Permission to travel with children

A parent travelling alone with their children (single parent or not) can often be asked questions at immigration about the status of the other parent. Usually a straightforward reply will suffice to satisfy the immigration official. A parent with a different surname to the child may have additional questions to satisfy immigration. The same considerations apply to friends or relatives travelling with children.

Some countries recommend, others require, a letter from any legal guardian who is not travelling with you, agreeing to your travel plans, or documentation of court orders granting you sole custody or similar arrangements. A signed letter to the effect of "I, parent to NN, know and approve of the travel of my child with their parent X" – or a similar letter signed by both parents, if neither is in the company – can smooth things over a lot even when none is strictly needed.

Some countries have legal requirements for a particular type of documentation, even for domestic travel. For some countries, the documents may require notarized signatures and perhaps an approved translation. Check recommendations and legal requirements with the appropriate department of your destination.

In general, if court orders apply to the care of children, for example following a divorce, you may wish to seek legal advice as to whether there is any risk of them being challenged at your destination. Take particular care if your child or your child's parents are citizens or possible dual-nationals of the destination country – or regarded as such: some countries grant citizenship implicitly in some situations (such as based on birth or residence there) or ignore denouncements of citizenship.

Get in and around

By plane

Main article: Flying with children

In general, flying is the most uncomfortable way to travel both for children and their parents. In turn, it can also be uncomfortable for other passengers. However, it is the usually the fastest and often the only way to get to certain places, and for some trips you'll just have to brace and prepare for the inevitable. The less time you spend walking through crowded airports and clearing security check points, the better.

By car

You may want your children to use appropriate child car seats when travelling by car. They are as important as seat belts are for you. Some countries require this. In some countries child seats can be rented along with a vehicle, but you may still need to bring your own. It is well worth researching well ahead of time what you need to do and checking with your travel agent or car rental company to see what is ideal.

Tips for a long car trip

Try to break the trip up into small sessions. Keeping a young and energetic toddler confined to a car seat can be as stressful for them as it is for you. On the other hand, having a lot of sessions in a row is not necessarily better.
Take a music collection your child enjoys. From time-to-time children are more than happy to bop along to your choices because at that age they don’t have a say, or an opinion, but when they’re distressed, over-tired or just plain bored – you need a better trick up your sleeve. Soundtracks to films such as Jungle Book and Mary Poppins seem to do the trick for younger children as well as a selection of fun children’s stories on CD. When all else fails, try soothing classical music to keep baby cooing. An alternative way is to scan the local radio for music stations.
For toddlers and up, tablet computers can be a godsend. Pre-load them with child-friendly entertainment and games as you may not be able to get an internet connection while you are travelling. If your child already has a tablet and is familiar with it, buy them some new games that they haven't played yet and introduce them as you're travelling. Keep in mind that some children can get travel sickness using these while on the move.
Drive early. Adults are a lot better than kids at adapting their daily rhythm. If you start your tour before sunrise the kids might still sleep for a few hours in the car.
Take a selection of toys to keep them occupied. Keep a little rucksack in the car filled with books and toys and keep a selection of "non-toys" to pull out in an emergency. A glovebox road atlas is a good and safe option to raise a smile, as well as make them think they are playing with something that they are not usually allowed.
Frequent stops for fresh air, nappy changes and just plain freedom, are essential on road-trips. Pack a blanket and a sandwich to make these stops more fun for all.

Children do occasionally get travel sick and vomit on long car trips, especially when the road winds. Sometimes they do not give enough notice to pull over properly. Preparing for this eventuality will enable you to recover should it happen, just having water, soap and a cloth stop this being any more unpleasant than it has to be. Consider carrying travel sickness bags if you have older children who can use them. Otherwise a small bucket or ice cream container will suffice in a pinch, and even young children can often manage to make less of a mess.

Child restraints

Child safety seats can generally be brought with you from home. However, if you are traveling to another country, you should check that your device from home meets the legal requirements at your destination.

Sharing a seat belt with a child is dangerous. In the event of a collision or hard braking you will jolt forward and the weight of your body will crush the child against the seat belt. On the other hand, even if you hold a baby or toddler tightly in your arms, the force of a collision will catapult them. If you want your child to survive a crash, a good child car seat is the only option. You are often allowed to get your car seat on a plane outside the normal allowances.

Children should be seated facing backwards as long as possible, at least up to four years old and 18 kg, as the forces on their neck will otherwise be too strong in a crash, already in 50 km/h (30 mph). If you are not using your own car, check airbag configuration: children must not sit where there is an active airbag (except when forward facing with some modern ones, and airbag curtains). Children need a restraint until they are 10–12 years and 135 cm (the latter is a legal requirement in the EU), as the seat belt in itself is not designed for young or small bodies. Older children can get away with a booster seat holding the lap belt and raising the child to get the shoulder belt in the right position, provided they can sit properly all the voyage (which might not be the case if they are tired).

In more developed countries, child car seats may be compulsory, and imported ones may not be certified for use there. If so, you might have to get one locally.

Car seat regulations are lax in many developing countries and you may choose to carry your own. However, in many countries, especially in South Asia, taxis may not even be equipped with seat belts. In these countries, you will either have to learn to live without a car seat and safety belt, or carry your own car seat and hire a car equipped with working seat belts.

Several companies make small, portable, restraints that act as travel car-seats. These can be folded up and packed in a day bag for use in rental cars and taxis. These only work, however, if there are adult lap or shoulder belts. Also check their certified effectiveness.

Rentals and taxis

If you are renting a car, most rental companies rent you child and infant seats at an additional cost. Check that what they offer is adequate.

The availability of car seats and the legal requirement to use or provide one in a taxi varies from country to country and city to city – even from company to company: In London, black cabs are exempt from the car seat regulation, while minicabs must provide one on request.

If you want your child to be in a suitable restraint, either carry your own or check local regulations before traveling. Isofix connectors may be absent in some cars, especially older ones, so a car seat that does not need those may be preferable.

By public transport

Make sure your children are seated and/or holding on to something in case of sudden stops (for trains: switches). Also be aware of travelling at peak times when public transport can get very crowded – try to learn when these times are and travel outside them.

Like when travelling by car, a little rucksack with books, toys and similar may save your day on longer journeys. Something to eat and drink is also good to have, although try to avoid overly messy or smelly food for the sake of your fellow passengers and yourself. Don't forget the baby wipes!

Bus

Public buses, for the most part, don't have seat belts. This often leads to children, especially younger children, wanting to climb on seats and run around. Try to (calmly) emphasize that this is dangerous and that they should sit down or hold onto something, especially as some bus drivers will brake and accelerate sharply. Even small children have no problem in behaving well on short rides (and less problems on long rides), if this mode of transport is a familiar one – train at home if possible.

On newer long-distance or even regional buses, there may be seat-belts and buckling up may be mandatory. While carrying a child seat may be impractical, having a booster seat or something usable as one can be painless – and may allow your child to actually see the landscape without sitting on your lap. Like in cars, don't share a seatbelt, as you would crash your child. As the bus is heavy, accidents where seatbelts are critical are much more rare than with cars.

If you are on a double-decker bus, such as the famous red buses of London, going up to the top deck of the bus and sitting in the front seats can be a lot of fun! The views are often great and you can pretend you're driving the bus!

Long distance buses usually have quite cramped seating compared to trains and don't allow any running around. The main advantage they have over a car is that you don't have to focus on the road and thus can keep your children entertained. You should try to ascertain whether the bus has a toilet or how often it makes bathroom breaks before booking.

Train

Many parents prefer travel by train over most other forms of travel as it enables children to run around (do make sure that the children do not disturb other passengers), there is more space, bathroom breaks are no major problem and the changing scenery provides a conversation topic and distraction. Furthermore there is usually more space than on a bus or a plane to play board games or employ electronic entertainment and not having to focus on the road means you can engage with the small travellers much better. Trains are also inherently fascinating pieces of technology to many children and adults alike and there are both numerous works of fiction and things published by railway companies themselves to satisfy the curiosity of little train enthusiasts while on a train. With the exception of tilting trains, motion sickness – which can be a major problem on planes, buses and cars – is also much rarer on trains.

Especially local trains can be very full at rush hours. Long-distance trains may have compulsory seat reservation, but otherwise they also may be full occasionally. In some countries more or less all public transport is crowded.

Some trains have children's cars, with playing space, entertainment, a place to heat food for infants and a well equipped toilet. Get a ticket with seats in or near that car. On some trains you can book a small compartment for yourself. A sleeper cabin can be a great adventure!

In some countries trains have "quiet carriages". These are, as they are labelled, carriages for people who do not wish to be disturbed by needless noise. Ensure that you do not book these carriages or get seats there on boarding, as trying to keep most children quiet is a fool's errand.

If your train is late for a transfer, talk to the conductor, as your ability to run or adjust your plans are limited. They are often understanding. Some railroads (e.g. Deutsche Bahn) have a tool on their online booking system to select only connections with transfer times over a certain margin when booking, but you can certainly ask an agent to select such a train when booking at the counter.

While the problems in tunnels in terms of pressure in the ears are not entirely unlike on planes, most travel problems children encounter are lessened by trains having more space and running at or close to ground level.

Of all modes of public transport, trains also generally have the most generous luggage allowance (though you might wish for some help loading and unloading), which can be a godsend if you have small children that need more stuff than you could ever carry in a small carry-on piece. Check whether special measures are needed to get a baby carriage on board – it won't be appreciated in the corridor of a busy commuter train.

By boat

Going by boat can be a great way to cover a lot of ground with young children or a fun way to relax with the whole family. Before booking you'll want to find out some specifics, at least on some journeys:

Are there child or infant rates? Do they include any activities?
How safe is the boat for children? What sort of railing is there on the main decks and possible cabin balconies?
What sort of child-friendly food is there?
Is it possible to request an early dining time?
Is there a children's play room or children's club on the boat?
Is baby sitting service available? In the cabins? In the evening?

When aboard, find out if there are life vests and other safety/emergency equipment available for smaller children (they may be at a separate location).

Keep children close by at all times and always check whether there are dangers, such as insufficient railing.

Cruises

While some cruises are specifically geared towards families and children, almost all cruise lines now have some services for families. Before booking a cruise you'll want to find out some specifics:

Are the excursions suitable for children? How much walking is involved? Is it possible to visit the sites unaccompanied?

On foot

You may want to put some thought in how you are moving around when not using vehicles. Are your children used to walking moderate distances?

Are you planning to bring a pram or stroller? The models differ quite a lot in versatility, in easiness to pack in tight spaces, in what luggage can fit, in usability in cobblestone streets or on beaches, etc. Old towns were quite emphatically not designed for strollers or the likes and can be more of a hindrance than anything. Similarly, getting a stroller into a full metro can be impossible, so avoid rush hour.

A baby sling can be a good alternative, especially if streets and roads are in bad shape. Some slings can be used to carry even quite big children (up to school age and more). If considering this, be sure both you and your child are used to the sling you choose before you leave home. Specialized backpacks are also available, mostly for quite big children.

By bicycle

See also: Cycling, Urban cycling

If your children are big enough and accustomed to cycling – and your routes and the traffic culture make biking safe – then go for it! Find out what local law says about bikes and whether there is something in the traffic culture you and your children need to check up on and learn. Keeping strictly to the right (or left, if appropriate) may be more important than what your are used to. Also consider how to get your bikes there or whether there are suitable bikes available. Do you want some special equipment?

Small children can ride as passengers if your bike is suitably equipped. In some jurisdiction a child seat (a lighter version of what is used in cars) is mandated. There are also other arrangements, such as a (purpose-built) bike lacking front wheel used as trailer or real trailers with seats for small children (perhaps up to 6 years or so). Note that gravel from your tyres may fly in the face of anybody behind you – there are screens on those trailers for a reason. As the trailer is low and wide, it usually has a flag on a pole, making it more visible.

You certainly want to have biking helmets for your children. Use helmets yourselves also, to protect you (what happens to your children if you are hurt?) and to avoid any arguments about their necessity.

Hiring bikes and equipment for children may be significantly more difficult than hiring adults' bikes. Check ahead. Whether bikes can be taken on planes, trains and buses varies, between countries, between companies and even between individual lines. Sometimes they need to be taken apart and packed to be allowed aboard. See Flying with bicycles and Cycling#Get in.

Biking among cars is usually quite dangerous also for seasoned bikers, and in an unfamiliar (perhaps chaotic) driving culture, you may not want to trust your children not to make mistakes. Check routes more carefully than you would on your own and have some reliable practice for stopping to discuss the situation when traffic isn't what you expected. Probably one of the adults should go first, and if they stop, everybody should.

In many jurisdictions children are allowed to cycle on the pavement, pedestrian traffic permitting. Leading your bike on the pavement is usually allowed, but if pavements are crowded, this might not really be an option.

Do

Take your time. If you try to visit a destination as in adult company, you will soon be miserable. Children often do not understand the grandness of the destinations: a toddler at the Rotterdam Zoo may well be most interested in the ants on the walkway. A picnic, a nap, a visit to a small playground, all of which are simple things you could as well do at home, will help the children keep their good temper. Indeed, keeping things much like at home may be key when children are becoming tired or otherwise might get grumpy.

Attractions such as swimming pools and amusement parks generally require younger children to be supervised by an adult caregiver or responsible older child. Age limits vary but if the child is getting in at the child rate, expect supervision to be required. If in doubt, ask.

There are "family" tickets to many attractions and sometimes on trains etc. Always check this option, as they may in effect give the children free tickets. Often they include two adults and two children, regardless of relationship. However Deutsche Bahn is notoriously insistent that the "free children tickets" discount only applies to actual (grand)sons and (grand)daughters.

Trips to child-friendly amusement parks such as Disneyland, Legoland, or those at the Gold Coast may keep children keen and even be enjoyable for adults. Wildlife sanctuaries or places where children can get up close with animals, or museums with dinosaurs or any other interests your child has, can all keep kids occupied and may make them put up with the "boring bits" of the trip their parents want to do.

Especially with smaller children, the important bit is to really have time for them; be attentive to their questions, observations and thoughts. If worries about the schedule or distractions around made you just rush forward and give orders rather than your ear to them, try to compensate at some nice place where they have your full attention – and make sure you really listen this time.

Eat

Breastfeeding

Breastfeeding is by far the easiest way to feed infants and young children on a trip. There's no preparation or utensils required and nothing extra to pack. If you are planning a voyage, then you might want to continue longer than you else would; many countries recommend 5–6 months of exclusive breastfeeding (letting your baby taste a bit of your food at any meal when old enough, but no formula), and partial breastfeeding to an age of 1½–3 years. In some cultures, partial breastfeeding is common significantly later.

While several countries, including Canada, Scotland and Sweden, and several US states, have laws guaranteeing a mother's right to nurse in public, it may be illegal in others – or just not universally accepted, legal or not. Usually breastfeeding just requires some discretion such as choosing a private place or using a sling for privacy, but it is best to be aware of legal and cultural issues before you arrive.

Mothers with new or colicky infants should be aware of the effect of introducing new or spicy food into their diet, as this can change the flavor of their milk. Also discuss whether any medication you need for the journey is safe for the child.

Bottlefeeding

Preparing milk or formula for young children while travelling requires some planning. On an extended trip or road trip it may be worth bringing a small electric kettle for boiling water unless you know you will have facilities available. Bring a bottle brush and soap for cleaning bottles or pumps in bathroom sinks. Find out what to do if the water may be unsafe. Check the availability of formula at your destination, or bring your own. Travel may not be the best time to try changing formula. If your child has special needs (such as soy based, organic or wheat-free formula), check that these are available at the destination. Mothers who are expressing and storing breastmilk for bottlefeeding will need to check on appropriate refrigeration facilities.

Restaurants

Many restaurants can accommodate young children and serve children sized meals. However, checking before booking a table is always wise. Some restaurants cater especially for families and offer permanent special deals or activities such as paper and pencils or a playing corner. In some countries, such as Finland, it is customary to have a special menu with a few common and neutral dishes for young children. The restaurant may also accept your bringing food for children too young to appreciate the restaurant's offers.

Evening meals

If your children aren't accustomed to eating dinner late in the evening, they may want your familiar evening meal. This can require some planning, as few hotels have facilities for preparing food and eating at your room, grocery stores may be closed at the time you arrive, and the foodstuff your children are accustomed to may be absent from the local store shelves.

Sweets

Sweets and juice are a multi-purpose tool. They can be used as a reward system in boring times. For example. Child says: 'I'm bored!' Parent says: 'If you sit still and read your book for another half an hour, we can park at a rest stop and eat some cake.'

Chewy sweets and suckers are also great for relieving the pressure on a child's ears when landing and taking off in an airplane. Have these ready, especially for younger children who are flying for the first time.

Use this tool restrictively, though. Too much sweets is never good, and it can both cause travel sickness and upset the normal eat and sleep rhythm. Depending on your child and what you have been doing at home, the "sweets" don't have to be unhealthy. Chewing on a carrot can work as distraction and variation in the same manner sweets would. Some children may appreciate local things uncommon at home, such as fresh peas bought at the open-air market or the farm you visited. Be aware that some healthy sounding sweets, such as dried fruit, often contain large amounts of (added) sugar.

Drink

Places that serve only or primarily alcoholic drinks may prohibit children, either due to the local laws or due to the owners' belief that they'll make more money if they provide an adults-only environment. Check the local bylaws before entering bars, nightclubs, and restaurants. There may be a special family entertaining area that that can be used or an attached restaurant.

Tap water can not be presumed safe to drink in many countries of the world. Parents need to take precautions to ensure children don't drink unclean water. Provide bottled water, sodas, or other drinks for them. Show them how to brush teeth with bottled water. Parents with babies will want to plan how to prepare bottles. Bringing your own pre-mixed formula (sold in disposable sterile bottles) is a good solution for shorter trips, but if weight or airline restrictions become an issue, powdered formula and locally purchased bottled water may work better. If your children are breastfeeding (and you find spaces for that, see above), then most of the problem goes away – plain bottled water and safe local food pose no big challenges.

Sleep

Many accommodation places are set up for adult singles and couples. Travelling as a group of three or more may require you to reserve an extra room or a special family suite. You should always reserve accommodation well in advance so that the proprietor can make appropriate arrangements, such as installing an extra bed. There may be additional charges for extra people as well.

Although there are hotels especially catering to families, most hotels built to be hotels, especially modern ones, are standardized to the two-per-room concept (often with the option of an additional bed) and optimized as to square meters per room. Older or odd buildings and other kinds of accommodation often have rooms more suitable for families. Some youth hostels have suitable facilities. Cottages are quite a safe bet, although you should check the standard (you probably want to avoid surprises such as lack of hot water).

In some locations there may formally be strict rules about number of persons in a room (enforced by booking software), while the proprietors could not care less and are happy to make needed arrangements. A phone call before doing the booking can help in such situations.

Hotels often offer in-house babysitting services or can refer you to a local service. You might also want to check facilities such as playing yards or parks in the vicinity. Check the language issue.

A vacation rental or a second home might provide security and comfort suitable for families with children.

Campsites are often very family friendly and you can either use your own camping or caravaning equipment or – at least at the bigger, more popular sites – rent a tent or caravan already built for you, or a cottage. Some of the companies that offer such services are so family-oriented that their default nomenclature for a party of guests is even "family" (though they of course also take the business of anyone not a family if they so chose).

Buy

What to take for your trip

The physical environment when travelling may have a negative effect on your child. To be prepared, you should consider bringing a few helpful provisions:

Child-friendly motion sickness pills
Lip balm and moisturizer for dry skin
Paracetamol (called acetaminophen in the US)
Sunscreen (check suitability for children)
Child car seat sun visor

Children are messy at the best of times. When they are in a car or on a plane, they make even more mess than usual. Do not give them full glasses of juice or watery puddings. Very importantly: keep your bag of cleaning essentials close by – not locked away in the overhead compartment, or in the boot of the car. Messy incidents will happen at the most inopportune times.

Here is a basic checklist to consider:

Wet wipes – an absolute must
A bag to throw rubbish in
A change of clothes for you and your child, packed in a plastic bag – trust us, you could very well need it, and the plastic bag makes a nice place to store the wet or dirty ones.
Extra wet wipes
Spare nappies for the babies, and a travel potty for the toddlers
A tea towel or two
More wet wipes
Have we mentioned wet wipes yet?

Don't forget plenty of materials to keep the kids entertained and fed. Bring more toys and snacks than you think you'll need, and load up a laptop or tablet with videos and games.

What to bring back home

For infants

Magnets for a fridge are very popular with infants at 7-10 months. (They like to remove them from the fridge and then put them back on. This is an exercise for the arms.) Go for rubber magnets with no sharp edges, no more than twice the size of the child's palm.

For bigger children

T-shirts with funny stamps.
Various presents according to age.

Pregnancy and childbirth

See also: Tips for female travellers#Pregnancy, Medical tourism#Childbirth

Travellers, especially those on long trips for business or study, may have children born while outside their home country. Aside from making sure that local birthing or medical facilities meet your requirements (including budget; also if there are complications), you will wish to make sure that your child's birth is sufficiently well-documented that you can at some point take them home!

If the circumstances of your birth, residence or citizenship are odd in some way, check that children born abroad indeed have the right to become citizens where you live; in some countries, being born there is one ground for citizenship. On the other hand, they may get an automatic citizenship in the country where they are born – in some cases, like Iran, a non-renunciable one. If either country doesn't recognise dual citizenships, you have a mess.

If you are already pregnant, consider whether, when and how to travel, and whether your destination is safe. Some of these considerations apply if you get or plan to get pregnant during your stay.

Risk of pregnancy complications, miscarriage or premature birth varies between pregnancies, and you should consider your own risk when planning travel where you will be away from your own medical practitioners, or away from medical facilities of the kind they are used to. Statistically, the safest weeks to travel are between the 18th and 24th week.
Many vaccines (specifically, live ones) are not considered safe for pregnant women (or often even women who are planning a pregnancy) to receive due to a risk to the health of the fetus. You might not be able to travel to destinations that require vaccinations you haven't had before getting pregnant. A waiver for the yellow fever vaccine can sometimes be obtained, depending on the prevalence of yellow fever at your destination. Some inactivated vaccines are considered safe, including varieties of the influenza vaccine and Hepatitis B. Even if you don't normally get vaccinated for influenza, some doctors may advise you to take this precaution as the disease can be more severe in pregnant women. In any case, consult a medical expert at least 6 weeks before travel.
The mosquito-borne Zika virus can cause severe damage to a child in the womb. There are defences, such as long sleeves and mosquito repellents, but there is no vaccine and no cure. The epidemic has ended, but the US and Canadian governments advise pregnant women to talk to a health care provider before travel to areas with a risk of Zika, and to take precautions against transmission.
Malaria, in addition to its danger to the woman, can also cause miscarriage or premature birth. Not all anti-malarial drugs are safe to take during pregnancy.
You should seriously consider getting comprehensive medical or traveller's insurance that would pay for you to be medically evacuated if needed. Should you plan on travelling to a country with restrictive abortion legislation, the need may include situations where an abortion is needed for medical reasons, but not legal or available at the destination.
Travel at high altitudes is not advised.

Some forms of transport have their own issues:

Air travel is not recommended for pregnant women beyond 36 weeks (earlier for complicated pregnancies or multiples), and most airlines impose restrictions on pregnant women close to term. You may need to present a letter to the airline from your doctor stating that you are less than 36 weeks pregnant and that it is safe for you to fly. Inquire directly with your airline. Some airlines require a letter from a healthcare provider much earlier in the pregnancy, and others, including the French boutique airline La Compagnie, have very specific rules (e.g., requiring a letter from a physician instead of a licensed midwife) that they do not disclose on their websites but will tell you over the phone. Also keep in mind that pregnant women have an increased risk of developing deep vein thrombosis (DVT), or blood clots. If travelling by air, get up and walk around to stretch regularly.
When using a seat belt, make sure to fasten it below your belly.

Some activities are not safe for pregnant women, particularly alpine and water skiing and scuba diving. Unaccustomed strenuous activity, hottubbing or saunaing might also cause complications. Check with your health provider, but in general the guideline is to maintain about the same level of activity that you did before pregnancy.

If you aren't very early in your pregnancy, you must take into account the possibility of giving birth unexpectedly. Make sure to check where to call and how to handle the situation.

What birthing centre are you planning to use? How do you get there? If planning to give birth "at home", how will you call a midwife? What are the procedures if there are any complications?
What about emergency births? Can you get an ambulance quickly? Should somebody staying with you get a quick course on how to assist if needed, especially if things don't go as they should?
Check with your home country's embassy about how to register the child's birth and apply for or record the child's citizenship.
Children born in some countries become citizens of that country by right of birth, with any benefits and liabilities that follow; see Medical tourism#Childbirth. If they don't, you will not only have to establish their citizenship of your home country but also meet any visa requirements and so on for them to stay with you.

Insurance

Check that pregnancy related illness, childbirth itself and medical care for a baby born while travelling are covered by your travel insurance if you're outside the reach of your normal healthcare arrangements. Pregnancy is usually considered to be a pre-existing medical condition that you must disclose to your insurer, and which will have limited coverage, particularly after the 30th week. Pregnancies that you don't know about at the time of application might not be covered. Read your travel insurance documents carefully.

No insurance policies cover expenses associated with a full term birth – but reciprocal arrangement with your domestic social security policies, or your foreign employer's policies, may cover them at least in part. Some may cover a very premature birth but then may not cover the baby's healthcare costs (which would likely be considerable).

Most travel insurance policies do not cover multiple pregnancies (twins, triplets etc) or any pregnancy that is the result of medically assisted conception (fertility drugs, IVF etc) even with an additional premium. If you do get cover for a higher risk pregnancy it will not extend as far into the pregnancy as cover for a naturally conceived singleton pregnancy; it will probably only extend to 15 or 20 weeks. It is close to impossible to get cover for any pregnancy that has already had complications.

Remember that you can't just "fail to mention" pregnancy (or any other information) to an insurer: failing to disclose relevant information invalidates the policy.

Stay safe

Your children should have age-appropriate knowledge of what to do when lost. Have an age-appropriate plan, and make sure everyone knows what they are going to do before setting out.

Younger children should always carry a card with their name, your name, contact details (hopefully including a mobile phone and accommodation details). It is too much to expect a young child to remember all this in an emergency situation. Children below school age may not even be able to tell strangers their names, especially if they're lost, frightened, and don't speak the local language.

Consider giving older children (usually at around 10) a mobile phone, or money and instructions on how to use a public phone.

An example of a plan could be for a child to go to last place they knew you were together, while the adult retraces their steps. Another plan includes nominating a particular location to meet on a particular trip.

Teach children who you would like them to approach. Consider whether you would like them to approach someone in uniform, which is something most children will recognize. Conversely, you should also teach your kids what kinds of people and situations to avoid.

There may be dangers neither you nor your children are accustomed to from home: deficit railing, rocky shores, wildlife big and small, toxic substances, lack of sidewalks, what have you. Check in advance and plan how to cope.

Stay healthy

Children may have special health needs while travelling:

Very young children may not be able to receive any vaccines, even routine ones, and will be very ill if infected with the associated diseases. Check with a healthcare provider about travelling with a child who is not vaccinated, either by choice or for age reasons.
Your healthcare providers can advise on the suitability of travel vaccinations for older children, if they cannot receive them you may wish not to travel to some destinations. Some children have difficulty swallowing tablets, and if they cannot, it can make things like malaria prevention extremely difficult (many tablets cannot be crushed; while some can, always check with the prescribing doctor or a licensed pharmacist before doing so with any given medication). Practice e.g. with M&Ms (a candy resembling medical tablets in shape and size).
Children may have difficulties swallowing pills without chewing them. It might be worthwhile to test and train at home, e.g. by using pills instead of liquids for things you give to your children anyhow (such as vitamin D during winter darkness in some regions).
Children get cold faster than adults. If in a cold climate or participating in winter sports, your children may need warmer clothes than you do, and it's likely that by the time you feel the cold your children are already on the way to hypothermia.
Children suffer motion sickness more easily than adults, particularly since they are usually relegated to smaller seats with less visibility. You might need to give them travel sickness medication and prepare to clean up if they are sick. Regular pit stops on car trips to let them get out and walk around help. If possible, choose seats with windows at the right height and in the front in buses.
Children and especially babies have trouble equalizing their ears on airplanes; see Pressure adjustment above.
Train your child a couple of weeks beforehand to brush their teeth and rinse out of a water bottle (if appropriate) and to wear slippers in the hotel rooms as well as flip flops in the shower to avoid picking up any foot fungus. Spraying feet with a fungicide may be a good preventative measure, but ask your physician first. If the doctor approves, consider making it routine for a while before leaving.

Cope

Make sure your kids are well rested before any long distances of travel. You do not want to bring a tired and grumpy child through security, or have them squirming and complaining in the coach or car. Do not overfeed your kids before a trip either. You do not want to get up every ten minutes to go to the bathroom with them and you do not want them to vomit.

Make sure your child has enough to keep him or her busy, entertained and satisfied for the duration of the trip. Think about all the on-flight entertainment available for adults – drinks, food, movies, sitcoms, soaps, documentaries, newspapers and music. Now double that and you are somewhere close to what your child needs.

Pack a rucksack full of toys for each child (they will use it the whole holiday), including one or two new ones that are wrapped. These do not have to be expensive: a sticker book, a new matchbox-sized car, a small can of cheap modelling dough, or a book with mazes or other pencil-and-paper games will all work for different ages. Don't let them open them until they get on the plane or in the car. Build up the excitement for them. Versatile toys that can be reused in various ways, like craft supplies and construction kits, are better than single-function toys. Also consider making a toy wallet full of little surprises for the child to explore.

If you are packing something that needs batteries then make sure you have spares. If it is an item with rechargeable batteries, such as a handheld console, make sure it is fully charged before you leave and keep the charger handy. For items that can be charged via USB, such as tablet computers, it is worth investing in a decent external battery pack so you can recharge while on the move. There are also adapters for using the 12V system of cars.

If you think you might want to leave a toddler in a kindergarten or with a babysitter, it's always a great idea to first make such an experience in your home country, in less unfamiliar conditions:

make sure a toddler is generally comfortable to stay without parents with a stranger [and with other children]
escape a language barrier that is much more likely to be found when travelling
avoid putting time-sensitive travel plans for a day at risk

Motion sickness, traveler's diarrhea, or even just a bit of unexpected bump while your child is holding an open cup of juice can mean you may need to access and re-distribute your suitcase's contents pretty quickly. Think about how you could deal with dirty laundry if you need to, both while you're still en route and after you have arrived at your destination. Bringing lots of disposable plastic bags is recommended.