Early Smartphone Use Poses Risks to Kids’ Mental and Physical Health
Recent research is shedding new light on the risks of early smartphone use for children, showing significant impacts on mental health, cognitive performance, and overall well-being. University of Pennsylvania researcher Ran Barzilay, a father of three, recently changed his approach after seeing early results from his study: his youngest child will not get a phone anytime soon.
Barzilay’s analysis of over 10,500 children across 21 U.S. sites found that receiving a phone at age 12 rather than 13 increased the risk of poor sleep by more than 60% and obesity by over 40%. For years, the debate over screens and teens relied on anecdotal evidence, but recent large-scale studies are providing stronger data. These studies link heavy screen use to slower processing speed, weaker memory, reduced attention, poorer sleep, and higher rates of depression and anxiety.
Some countries are taking action. Australia recently banned social media for children under 16, and Malaysia plans a similar move. In the U.S., some states have introduced restrictions, with figures like former Chicago Mayor Rahm Emanuel calling social media among children a public health crisis, according to The Washington Post.
The distinction between total screen time and addictive use is critical. Research using the Adolescent Brain and Cognitive Development (ABCD) dataset, tracking nearly 12,000 children born between 2005 and 2009, found that compulsive or addictive use—distress when separated from a device—tripled the risk of suicidal thoughts and behaviors. Video games were linked to anxiety and depression, while heavy social media use was associated with rule-breaking and aggression.
Studies also reveal that even low social media use can modestly reduce cognitive performance, affecting reading, memory, and vocabulary. Attention can be particularly affected, as constant notifications and the anticipation of messages create distractions that weaken focus over time.
Experts stress moderation and parental guidance over outright bans. Pediatric neuropsychologist Jennifer Katzenstein recommends modeling healthy device use and gradually reducing screen time. Megan Moreno of the American Academy of Pediatrics emphasizes ongoing communication with children about phone habits.
Barzilay explains to his 9-year-old that delaying phone use supports long-term health, emphasizing that early access in previous generations was due to lack of awareness. He urges parents not to feel guilty: “Kids got smartphones at young ages because we didn’t know. Now we know.”
This wave of research highlights the importance of timing and responsible introduction of technology to protect children’s development, mental health, and overall well-being.
