WASHINGTON DC. WA, October 5, 2026 — According to a large new study, children who have their own smartphones before the age of twelve are at significantly higher than average risk for a number of different health problems. Researchers connecting early smartphone use to higher rates of all round depression, obesity and cigarette smoking and inadequate sleep. The results add to a burgeoning global evidence base on childhood digital device use.
Inside the Research
This study – involving researchers from Children’s Hospital of Philadelphia, UC Berkeley, and Columbia University – used data from more than 10,500 participants. The research utilized a data set of more than 11,000 children from the Adolescent Brain Cognitive Development Study, which is the U.S.’s largest long-term study of child brain development. Results were published in the journal Pediatrics, the official publication of the American Academy of Pediatrics.
By age twelve, more than sixty percent of the children studied owned a smartphone (median acquisition age: eleven). Children who were given a first phone at age 13 also fared equally badly, the researchers found. It suggests a link, not that smartphones are the direct cause of these illnesses.
How the Health Risks Appear
On the higher end you had children who’d been getting phones at an earlier age showing measurable depression rates compared to those classmates without devices. Obesity levels were also higher, a trend which researchers attributed to less active behaviour in smartphone users. Another common finding within the large participant numbers of the study was sleep disruption.
Fast notifications and flashy graphics train toddler brains to become accustomed to constant stimulation, pediatricians say. How that pattern manifests may influence attention span and emotion regulation in ways researchers are still trying to understand. According to doctors at Children’s Hospital of Philadelphia, early exposure can also prevent children from correctly reading non-verbal social cues.
Why Timing Matters for Children
Scientists pointed out the fact that ages five and twelve is a crucial time for attention control as well, since children’s brains develop quickly during these years. Perhaps filling that gap with constant digital stimulation will interfere with natural development. Doctors say this means deciding when to give a child their first phone matters even more than it was previously thought to.
The authors of the study stopped short of recommending a specific age at which kids should get smartphones. Rather than a specific age, they encouraged families and pediatricians to have thoughtful conversations about readiness on a case-by-case basis. That broader conversation depends on things like a child’s maturity, home environment and plans for how a phone will fit into their life.
Practical Guidance for Families
Once a child has received a smartphone, the researchers outlined possible actions parents could take to mitigate harm. One of the more common interventions suggested was keeping phones out of bedrooms overnight. Urgent need for every house, particularly with toddlers to have some phone free activity was another repeating recommendation across the research team.
The American Academy of Pediatrics is adapting its guidance in this area as research published on device use in childhood. For now, families must balance the obvious goods of connectivity with a growing number of well-established health risks. Pediatricians say the choice is ultimately up to each kid and family.
However, lead author of the study, Professor Andrew Przybylski at Oxford Internet Institute school said that smartphones also have distinct advantages for older teenagers who are negotiating school and social life. In some contexts, access to safety features, educational tools, and peer connection can outweigh the risks for certain children. The researchers cautioned that blanket bans are far less effective than a well-wrought individual-based determination regarding the personalized needs of each child.
The findings underscore ongoing discussions among public health officials about screen time guidelines in schools and at home, experts said. Many school districts have already implemented phone-free policies during instructional hours, expressing similar anxieties surrounding attention and mental health. This new research has been leveraged by parent groups to advocate toward having more uniform guidance among school districts.
The researchers will continue to track these same children as they enter into even deeper adolescence. Some future findings may help to inform whether early health effects persist, worsen, or vanish over time as children practice better habits as they mature. In the meantime, experts caution that families should take the current data as a significant but not conclusive basis for caution.
