Screen time and children: what the biggest review says

On 28th September 2026, JAMA Pediatrics published the largest pooling of research on children and screens so far. A team led from the University of Calgary combined 23 meta-analyses covering 2,817,252 children and young people aged 18 and under in 64 countries. It found that more screen use went with lower school attainment, weaker language skills, and more emotional and behavioural difficulties (Al-Jbouri et al., 2026). The headlines that followed were about the 2.8 million. The number a parent can use is a different one: how strong those links are. They are real and they are small, and the review cannot say which way they run. That changes what is worth doing at home.

What the review found

An umbrella review is a review of reviews. The authors did not run a new study. They gathered every meta-analysis of population-based samples they could find up to November 2025, converted the results to a common scale, and analysed them again. Across those studies, more screen use was associated with lower overall academic achievement (a correlation of -0.15) and weaker language skills (-0.14). It was associated with more internalising problems, the inward-facing difficulties such as anxiety and low mood (0.10), and with more externalising problems such as aggression and hyperactivity (0.11). Social media use taken on its own showed almost the same link with internalising problems (0.09). There was no association with executive functioning, the mental skills behind planning and self-control, and the results for reading, maths and science taken separately were too uncertain to call (Al-Jbouri et al., 2026).

How big is small

A correlation runs from 0, no relationship, to 1, a perfect one. At 0.10, screen use accounts for roughly 1 per cent of the differences between children in anxiety and low mood. One of the independent academics asked to comment on the paper drew out exactly that figure: the association is there, it is very small, and screen use alone does not explain why a particular teenager is distressed or doing less well at school (Science Media Centre, 2026). Two larger figures in the paper, for emotional problems (0.30) and peer problems (0.28), rest on far fewer studies and carry wide margins of uncertainty, from 0.08 to 0.50 in the first case, so they deserve caution. A small average effect across millions of children still matters for public policy. For one child at one kitchen table, it means hours on a screen will rarely be the main explanation for how they are doing.

What the review cannot tell you

Most of the studies behind these figures are cross-sectional: they measure screen use and wellbeing at the same moment. Professor Esther van Sluijs of Loughborough University, who called the review high quality, pointed out that this design cannot show cause, and that there was not enough data to draw firm conclusions about particular kinds of use such as social media or gaming (Science Media Centre, 2026). Both gaps matter. A child who is anxious or low may turn to a screen more because it is the easiest place to be, in which case the screen is a sign of the difficulty as much as a source of it. And "screen time" as a single number puts a video call with a grandparent, a homework platform, three hours of short videos and a game played with friends in the same column. The authors themselves report that the type of screen, the child's age and the kind of difficulty changed the size of some of the associations (Al-Jbouri et al., 2026).

What the official advice says, in England and in Wales

The clearest official numbers are for the youngest children. In March 2026 the Early Years Screen Time Advisory Group, chaired by Professor Russell Viner and Dame Rachel de Souza, recommended that children under two avoid screens except for shared activities such as video calls with relatives or looking at family photos together. For two to five year olds it recommended no more than an hour a day, ideally in chunks of 30 minutes or less, away from mealtimes and bedtime, with as little solo use as possible. The group was frank about what that rests on. It described the evidence as emerging and often of low quality, with mixed findings and major gaps, and said it had taken a precautionary approach where evidence was lacking. It also said the limits do not apply to the screen-based assistive technology some children with special educational needs and disabilities rely on (Early Years Screen Time Advisory Group, 2026). The report was written to support guidance for parents in England, though the group thought its findings were likely to apply in the other UK nations. For five to 16 year olds there is no official daily figure yet. In June the Department for Education announced guidance for that age group in England, due this autumn, and said it would avoid blanket rules (Department for Education & Department of Health and Social Care, 2026). In Wales, the Welsh Government's Hwb advice for children and young people sets no time limit and says the right balance will be different for each person (Welsh Government, n.d.).

What to look at instead of the total

The advisory group's central point was written about under-fives, and it is a sensible test at any age: screen use becomes a problem when it crowds out sleep, physical activity, play, and time talking with the people a child lives with. It found that watching together and talking about what is on screen improves young children's language and thinking, and it recommended screen-free bedrooms, no screens in the hour before bed, and screen-free mealtimes (Early Years Screen Time Advisory Group, 2026). That gives a parent four questions that are more use than a daily total. Is your child sleeping enough, with the device out of the bedroom overnight? Has anything they used to do, a sport or a friendship, quietly dropped out? What are they doing on it, and with whom? And how do they come off it: with ordinary grumbling, or with distress that takes an hour to settle? One of the academics commenting on the review made the same point: how many hours matters less than which device, for what purpose and with whom (Science Media Centre, 2026).

When the screen is a sign of something else

Sometimes the answers to those questions point away from the screen. A child who has stopped seeing friends and now lives online may have found the one place where social contact feels manageable. Gaming until two in the morning can be a way of putting off a bed where the worrying starts. In both cases the device is doing a job, and taking it away without finding out what the job is can make the day harder without telling you anything. The signs that it is time to ask for help are the same as for any change in a child: mood, sleep, behaviour or school attendance that has shifted for more than a few weeks, that is getting in the way of ordinary life, and that does not improve once sleep and routine are back in place.

Blip is a specialist mental health service for children and young people aged 7 to 25. If your child's mood, sleep or behaviour has changed, and cutting back on screens has not changed it back, get in touch. One of our clinicians will talk it through with you and, if an assessment would help, arrange one with a named clinician. You do not need a referral.