Writer and health educator Marni Sommer is co-author of A Girl's Guide to Puberty & Periods, which aims to help young people ages 9 to 14 understand the changes that happen in puberty and what to expect when. Grow & Know/Screenshot by NPR hide caption
In a study of nearly 5,600 U.S. youths ages 12 to 17, about 6 percent say they've engaged in some sort of digital self-harm. More than half in that subgroup say they've bullied themselves this way more than once. Jasmin Merdan/Getty Images hide caption
A growing number of pediatric sports medicine groups warn that when a child focuses on a single sport before age 15 or 16, they increase their risk of injury and burnout — and don't boost their overall success in that sport. Hero Images/Getty Images hide caption
A child takes a facial recognition test in which he is asked to match the face on the top to one of the faces on the bottom. Jesse Gomez and Kalanit Grill-Spector at the Vision and Perception Neuroscience Lab/Science hide caption
In a video posted to YouTube last year by the women's health company HelloFlo, a preteen girl fakes her period and faces unexpected, and embarrassing, repercussions from her mother. YouTube hide caption