Lego is a very popular toy for children, which can help them improve their creativity and imagination. Here are some Lego bricks suitable for children under 10:

-Lego City Series: The building blocks of this series include buildings, vehicles and people. In cities, children are allowed to simulate life scenes.

-Lego Good Friends Series: The building blocks of this series include all kinds of animals, plants, vehicles, etc., so that children can learn different creatures and objects.

-Lego Star Wars series: The building blocks of this series include classic scenes and characters in the movie, which can let children know the story of the movie.

-Lego superhero series: The building blocks of this series include all kinds of superheroes and villains, allowing children to use their imagination and create their own stories.

I hope this information can help you. If you have any other questions, please feel free to ask me.