One month before William and Carissa Hawn's second son was born, their first son, Logan, then 3, was diagnosed with autism.
"Logan was our first experience with autism," said William Hawn, 34, of Modesto, Calif.
But when their second son, Aaron, was born, his pediatrician told the Hawns there was a 10 percent chance that he too would develop autism.
Earlier studies are consistent with Aaron's pediatrician. Infants who have siblings with autism have a 3 to 10 percent increased risk for...Full Story