A child plays in a Beijing park. Health threats caused by pollution have become a major concern in China. Andy Wong/AP hide caption

If you've noticed that kids seem to be better at figuring out these things, you're not alone. iStockphoto hide caption

An elementary school student Shane Shorter gets a a dose of FluMist in Gainesville, Fla. Doug Finger/Gainesville Sun/Landov hide caption

Doctors may be more hesitant to discuss environmental hazards than the risks of smoking and drinking. iStockphoto hide caption

Cuddling up to read a story with the very young helps them recognize words and learn vocabulary, researchers say. Jo Unruh/iStockphoto hide caption

The cross country team may do more for your child's grades than the math tutor. Robert Brown/iStockphoto hide caption

Antidepressant use nationally fell by 31 percent among adolescents between 2000 and 2010. Suicide attempts increased by almost 22 percent. JustinLing/Flickr hide caption

Girls who were arrested and detained were at particular risk for premature death in adulthood. iStockphoto hide caption

As Lindsay Lohan's character (far left) learned in the movie Mean Girls, popularity comes at a price. The Kobal Collection hide caption

School nurses are more likely to be treating students' asthma, ADHD or epilepsy than cleaning up boo-boos these days. Jamie Kingham/Corbis hide caption

Brian Micalizzi, a pharmacist at Children's Medical Center in Dallas, prepares an antibiotic prescribed to a patient in the emergency department. Juan Pulido/Courtesy of Children's Medical Center hide caption

To keep children healthy, it may take a city that's dirty in just the right way. Carey Kirkella/Getty Images hide caption

Being born prematurely increases the risk of lifelong health problems. AndyL/iStockphoto hide caption

Maltreatment in childhood raises the risk of physical and mental health problems throughout life. RenoCdZ/iStockphoto hide caption

Currently, half of all products served in the school lunch program must be "whole-grain rich," which USDA defines as products made of at least 50 percent whole grain. According to the new standards, by the start of the next school year, schools must use only products that are whole-grain rich. Rogelio V. Solis/AP hide caption