We’ve all heard that common refrain that the iPad is the perfect babysitter of the modern age. While some parents say it in jest, others are perfectly serious—the average kid today spends 9 hours a day looking at a screen. Letting kids play with tech isn’t a problem in itself, but studies have linked kids’ excessive screen use with physical, social, developmental, and emotional problems. Keep reading to see the research and why good parenting may mean less screen time for your children.