Pharmacist Kristy Hennessee administers a vaccination against whooping cough at a Walgreen's pharmacy in Pasadena, Calif. last year. Robyn Beck/AFP/Getty Images hide caption

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Judith Ursitti is a Massachusetts mother of two children with autism spectrum disorders. Her son, Jack, 7, has severe autism, while her daughter, Amy (not pictured), who is 11, has Asperger's. Richard Knox/NPR hide caption

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A new fetal DNA test to determine a baby's gender could be more accurate and faster than an ultrasound, researchers say. André Panneton/iStockphoto.com hide caption

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When it comes to potty training advice, pediatricians don't have much science to look to. iStockphoto.com hide caption

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Pediatricians recommend that kids acclimatize to the the heat by taking it easy the first two weeks of practice. iStockphoto.com hide caption

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Cans of fruit-flavored Four Loko in the liquor department of a convenience store in Miami in 2010. Joe Raedle/Getty Images hide caption

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