Cartoons can be harmful, but not always.
A good majority of cartoons are for children 11 and younger, like "Amazing World of Gumball" or, for younger children, "Mickey Mouse"
Some cartoons though display aggressive behavior which may not be best for young children to watch, since young children idolize these cartoons.
Though, cartoons can be harmful in another way. It encourages the children that, as they grow up, they'll spend more time on a computer or watching TV. This can be harmful for their health.
Hope this helped a bit!
