People wait in line at the Durham County Health Department for the H1N1 flu vaccination in Durham, N.C., in November 2009. Gerry Broome/AP hide caption

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Though scientists have identified sleepwalking triggers, the condition is still a bit of a mystery. Victoria Alexandrova/iStockphoto.com hide caption

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Social worker Shannon Coyne and her husband decided against circumcision for their son, now 11 months old. The nation's most influential pediatricians group says the health benefits of circumcision in newborn boys outweigh any risks and that insurance companies should pay for it. Matt Rourke/AP hide caption

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Ashley Beecher, 29, and her daughters Annie (on lap) and Charlie. After feeding Annie, Beecher donates her extra supply to the human milk bank at Texas Children's Hospital. KUHF hide caption

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Childhood obesity is on the rise in many countries and overuse of antibiotics is now on the radar as a possible factor in the epidemic. Here 18-month-old twins are weighed in a nutritionist's office in Colombia. Raul Arboleda/AFP/Getty Images hide caption

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Jamari Brighthaupt, 11, gets blood drawn by registered nurse Rae Montilla at the Georgetown Pediatric Mobile Clinic. Jessica Camille Aguirre/NPR hide caption

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It may not be the best strategy to stay up late and cram. A new study finds that when teens don't get the sleep they need, all kinds of things can go poorly. iStockphoto.com hide caption

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When it comes to pain relief for kids, there may be better options than codeine. iStockphoto.com hide caption

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No more tears, and no more quaternium-15 for Johnson's Baby Shampoo. Mike Clarke/AFP/Getty Images hide caption

itoggle caption Mike Clarke/AFP/Getty Images