Children are getting them younger and younger. Maybe your son or daughter had one even before becoming a teenager. No, we’re not talking about braces or deodorants.

We’re talking about cellphones.

For years, debate has raged over at what age a child should own a phone — let alone have access to apps like social media. Now, research is quantifying just how early use of smartphones and heavy screen time can be harmful.

A new study found that those who received phones at age 12, compared with those who got one at 13, had more than a 60% higher risk of poor sleep and more than a 40% higher risk of obesity. That’s according to a publication from 2025 by the American Academy of Pediatrics.

Other studies show high levels of screen time are linked to measurable dips in cognitive performance — like slower processing, reduced attention spans and a weaker memory. Rates of depression and anxiety climb with more social media, too.

One country, Australia, became the first to ban social media for children younger than 16 in 2025. The ban included TikTok, YouTube, Instagram and Facebook.

Some neuropsychologists instead recommend setting an example — one led by parents, that is. Children tend to replicate behaviors observed in mom and dad. Even if it’s as small as cutting screen time for one hour a day, a decrease like that might lead to better long-term wellness and quality of life.

Communication is also key. If you are a parent, try to avoid being reactive —have a conversation instead. For kids eager to assert their independence, it might go over a little better … or at least result in fewer eyerolls.