Children aged two to four should not be allowed more than one hour of "sedentary screen time" per day and infants less than one year old should not be exposed to electronic screens at all, the World Health Organization (WHO) said on Wednesday.
The United Nations agency, issuing its first such guidelines, said under-fives should also be physically active and get adequate sleep to help develop good lifelong habits and prevent obesity and other diseases in later life.
Sedentary screen time would include watching television or videos and playing computer games.