A student gets vaccinated against pertussis at a Los Angeles middle school in 2012. The state required that students be immunized to halt an epidemic of whooping cough. Kevork Djansezian/Getty Images hide caption

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Goodbye, Sodas. McDonald's says it will now market and promote Happy Meals only with milk, water or juice. Bill Parrish Photography/PR Newswire/AP hide caption

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Arefa with Jami Valentine (left) and Staci Freeman. Arefa, who first stayed with the sisters while receiving medical care last year, came back to the U.S. this summer for follow-up treatment. Gloria Hillard for NPR hide caption

itoggle caption Gloria Hillard for NPR

That's how it's supposed to work. But for most new moms, breast-feeding doesn't come easily, a study finds. iStockphoto.com hide caption

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Does a glass or two of wine during pregnancy really increase the child's health risks? Epigenetics may help scientists figure that out. Katherine Streeter for NPR hide caption

itoggle caption Katherine Streeter for NPR

Scoliosis didn't keep golfer Stacy Lewis from becoming a top-ranked pro. She spent almost eight years wearing a back brace, yet still had to have surgery. Jonathan Ferrey/Getty Images hide caption

itoggle caption Jonathan Ferrey/Getty Images

Genetically modified to be enriched with beta-carotene, golden rice grains (left) are a deep yellow. At right, white rice grains. Isagani Serrano/International Rice Research Institute hide caption

itoggle caption Isagani Serrano/International Rice Research Institute

Beer pong and other drinking games are popular among teenagers, and play a role in binge drinking. iStockphoto.com hide caption

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Teenagers put in more than two hours a day of TV time on average, still more than what pediatricians say is healthy. iStockphoto.com hide caption

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Kali Hardig, 12, was released from a hospital in Little Rock, Ark., on Sept. 11 after surviving a brain infection caused by amoebas. Danny Johnston/Associated Press hide caption

itoggle caption Danny Johnston/Associated Press