Dr. Nayna Patel performs an ultrasound exam on Rinku Macwan, at a hospital near Ahmedabad, India. It's illegal in India for doctors to reveal a baby's sex during these exams, but many do it anyway. Sam Panthaky/AFP/Getty Images hide caption

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George McCann has been diagnosed with a subtype of bipolar disorder called the "fear of harm" profile, and finds that a prescribed dose of ketamine every few days alleviates his symptoms. Michael Rubenstein for NPR hide caption

itoggle caption Michael Rubenstein for NPR

Prepacked foods marketed for toddlers can have extremely high levels of sodium compared to the 1,500-milligram daily limit recommended by the American Heart Association Daniel M.N. Turner/NPR hide caption

itoggle caption Daniel M.N. Turner/NPR

April DeBoer (second from left) sits with her adopted daughter Ryanne (left) and partner, Jayne Rowse (fourth from left), and her adopted sons Jacob (middle) and Nolan (right) at their home in Hazel Park, Mich. The lesbian couple's desire to adopt each other's children has grown into a potentially ground-breaking challenge to Michigan's ban on same-sex marriage. Paul Sancya/AP hide caption

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Parents are currently advised to switch toddlers to reduced-fat milk at age 2. David M. Goehring/Via Flickr hide caption

itoggle caption David M. Goehring/Via Flickr

The anthrax vaccine has been given to more than 1 million adults in the military. But no one knows how well it would work in children. Randy Davey/Reuters/Landov hide caption

itoggle caption Randy Davey/Reuters/Landov

Robert Monges, a coach for James Lick High School, checks tight end Dominic Brewster for a concussion during a football game played in Morgan Hill, Calif., in 2006. Patrick Tehan/San Jose Mercury News/MCT/Landov hide caption

itoggle caption Patrick Tehan/San Jose Mercury News/MCT/Landov

Lauren Fant winces as she receives her third and final shot of HPV vaccine from nurse Stephanie Pearson in Marietta, Ga., in 2007. John Amis/AP hide caption

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Maria Texeira-Gomes holds a photo of her 5-year-old son, Matheo, who has struggled with asthma nearly all his life. Richard Knox/NPR hide caption

itoggle caption Richard Knox/NPR

By taking antiretroviral drugs during pregnancy, this Tanzanian mother lowered the risk of passing HIV to her daughter. Siegfried Modola/AFP/Getty Images hide caption

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Donta Jackson's snack of choice is a bag of Skittles. Brett Myers/Youth Radio hide caption

itoggle caption Brett Myers/Youth Radio