of Pediatrics recommends no more than one to two hours of screen time a day for kids over the age of two, he thinks one hour is plenty.
"The single most important thing for children is time with parents and caregivers," he says. "Nothing is more important in terms of social development. If time with the tablet comes at the expense of that, that's not good."
Dr. Rahil Briggs, a pediatric psychologist at New York's Montefiore Medical Center, says tablet usage needs to be limited for the youngest of children, because too much screen time can slow language development. And since there's very little research out there so far, experts still don't know exactly how much is too much, she says.
For older children, Briggs says too much tablet use can slow social development. She notes that the solitary nature of the activity means that kids aren't using that time to learn how to make friends or pick up on social cues.
Some experts, however, believe tablets and smartphones possess unique educational benefits.
Jill Buban, dean of the School of Education at Post University in Waterbury Conn., says the more children absorb and understand technology before they start school, the more comfortable they'll feel when they enter a classroom for the first time.
But she says even the best educational apps must be monitored by parents and limited. She recommends no more than 30 minutes of tablet usage at a time in light of the short attention spans of most young kids.
"There's so much media out there and so much marketing," she says. "It's all about smart choices and research, whether it's an app on a tablet or a TV show."
Susan Linn, director of the Campaign for a Commercial-Free Childhood, says parents should be wary of any TV show or app that touts educational benefits for babies or toddlers, saying that scientists have yet to prove that there are any.
"Babies and young children are spending huge amounts of time with screen media when really what they need is hands-on creative play, active time and face-to face time with the people that love them," Linn said.