The World Health Organization suggests no screen time at all for children below the age of one, and no more than one hour per day for under-fours. Sign up for our free Health Check email to receive exclusive analysis on the week in health Get our free Health Check email Get our free Health Check email Email * SIGN UP I would like to be emailed about offers, events and updates from The Independent. Read our Privacy notice Screen time has long been blamed for making children inactive, but it