Study Warns of Health Issues from Pre-Teen Smartphone Access

A new large‑scale study, based on over 10,500 U.S. kids, finds that giving a child a smartphone before age 12 is linked with significantly worse health outcomes in early adolescence,according to Yahoo News. 

The research — led by teams from Children's Hospital of Philadelphia, University of California, Berkeley and Columbia University — draws on data from the Adolescent Brain Cognitive Development Study (ABCD), considered the largest long-term study of brain development and child health in the United States. 

According to the findings published in the journal Pediatrics, children who owned a smartphone by age 12 were about 1.3 times more likely to suffer depression, 1.4 times more likely to become obese, and 1.6 times more likely to get insufficient sleep, compared with peers who didn’t own a phone. 

The study also found that those who got a smartphone between ages 12 and 13 still had elevated risk of sleep problems and mental‑health issues by age 13 — though the risks were strongest for the youngest group. 

Researchers emphasize they did not track what children did on their phones — rather the fact of “owning a personal smartphone” at a young age was associated with poorer health outcomes. 

Lead author Dr. Ran Barzilay urged parents and policymakers to treat smartphone access as a significant factor in adolescent health. He suggested that families think carefully before giving a child a phone, and — if they do — to set clear usage rules: restrict phone use in bedrooms, during homework or family meals, and monitor sleep and activity habits. 

Still, the authors don’t call for an outright ban. Instead, they recommend a balanced approach: when children do have phones, parents should ensure kids still get sufficient sleep, outdoor time, and active play. 

Given the rising number of kids with personal mobile devices — over 60% of parents of 11‑ to 12‑year‑olds reportedly grant their child a smartphone — the study’s findings highlight a growing public‑health concern. 

Ultimately, while smartphones can offer social and practical benefits, this research suggests early ownership may carry serious risks — and parents should be mindful when deciding whether and when to give their child a smartphone.