From pediatrician offices to courtrooms, concern about children and screens has reached a new decibel. But in homes and schools across the globe, digital media use isn’t a fringe risk but an apparent inevitability—one that’s so embedded into nearly every aspect of a child’s daily life that it makes it less a question of whether kids use screens than how. A major meta-analysis of existing evidence published in JAMA Pediatrics offers some of the most comprehensive evidence to date on ho...