Great cartoon for preschoolers. If I were three years old, this is what I would want to watch all the time.
It's fun, educational, and the narrating voice for the English version is lent by Stephen Fry. It doesn't get any better than this!
Two series have been made, each consisting of 52 episodes. An additional season, called "Let's Go Pocoyo!", was created to teach English to Spanish kids. Three more seasons were released between 2016 and 2018. Each episode is 7 minutes long.
I like "Pocoyo" for its original format: made entirely using 3D technology, the background is white, and the narrator interacts with Pocoyo and the viewers. Each story teaches a word or value. The sound effects are very funny and the stories are smart and fresh.
Pocoyo's channel on YouTube is very popular. It offers a wide variety of videos in no less than 13 languages. A fun way for your kid to learn new languages!