Kindergartners who get more than two hours of screen time a day may be more likely to have behavior and attention problems in school than their classmates who spend less time in front of televisions, smartphones and tablets, a Canadian study suggests.

Doctors urge parents of young kids to limit screen time or avoid it altogether because all of those hours watching videos or gaming have been linked to slowed development of speech and language, fine and gross motor skills, and social and behavioral skills.

After all, time spent in front of screens means less time for scribbling with crayons or playing games that help kids learn how to kick a ball or take turns.