Letting a toddler spend lots of time using screens may delay their development of skills such as language and sociability, according to a large Canadian study.
The research, which tracked nearly 2,500 two-year-olds, is the latest piece of evidence in the debate about how much screen time is safe for kids.
In Canada and the US, experts say children should not use screens before they are at least 18 months old.
But UK guidelines set no such limit.
The Royal College of Paediatrics and Child Health says there is not enough evidence, even when you include this new study, for a “direct toxic effect”.