Researchers found higher rates of depression, poor sleep and obesity among tweens who had early access to a cellphone.
What is the “right” age to get your child a smartphone? It’s a question that vexes many parents — torn between their pleading tweens and researchers who warn about the potential harms of constant connectivity. But new study findings strengthen the case for holding off.
The study, published in the Journal Pediatrics on Monday, found that children who had a smartphone by age 12 were at higher risk of depression, obesity and insufficient sleep than those who did not yet have one. Researchers had analyzed data from more than 10,500 children who participated in the Adolescent Brain Cognitive Development Study — the largest long-term look at children’s brain development in the United States to date.
The younger that children under 12 were when they got their first smartphones, the study found, the greater their risk of obesity and poor sleep. The researchers also focused on a subset of children who hadn’t received a phone by age 12 and found that a year later, those who had acquired one had more harmful mental health symptoms and worse sleep than those who hadn’t.
“When you give your kid a phone, you need to think of it as something that is significant for the kid’s health — and behave accordingly,” said Dr. Ran Barzilay, lead author of the study and a child and adolescent psychiatrist at Children’s Hospital of Philadelphia.
The new study shows only an association between getting a smartphone earlier in adolescence and poorer health outcomes, not cause and effect. But the researchers point to previous studies that suggest that young people who have smartphones may spend less time socializing in person, exercising and sleeping — all of which are essential for well-being. Adolescence is a sensitive time when even modest changes to sleep or mental health can have deep and lasting effects, they notice.
The purpose of the study is not to shame parents who have already given their children devices, Dr. Barzilay said. And he is realistic about how grained smartphones have become in American adolescence.
The takeaway, he said, is that age matters.
“A kid at age 12 is very, very different than a kid at age 16,” he said. “It’s not like an adult at age 42 versus 46.”
The median age at which children in the study got their first smartphones was 11. And virtually all of American teens now say they have access to a smartphone, according to a recent Pew report.
Jacqueline Nesi, an assistant professor of psychiatry and human behavior at Brown University, who writes the newsletter Techno Sapiens, about parenting in the digital age, cautioned that the new study could not prove that smartphones were directly causing harm.
“It doesn’t mean that every kid with a smartphone has a problem for life,” he said. “All it means is that us as parents — and, I hope, also policymakers and society — are going to do something about it together.”
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