How much screen time should children be allowed?
How much screen time is too much for babies and young children?
The World Health Organization has advised parents that under-twos should not spend any time passively watching screens.
Children aged two to four should not spend more than an hour a day watching programmes or playing computer games, it also says.
But are such guidelines helpful? BBC Health Correspondent Dominic Hughes asked parents about their experiences.
Produced by Niall-James Convery and Hannah Gelbart for the BBC News at Six and Ten