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Decoding Autism

Worry has always been a side effect of pregnancy. But one anxiety--will my baby be normal?--has recently come to include a new concern: autism. First identified in 1943, the disorder is commanding unprecedented interest, mostly because of the reported rise in its incidence, but also because its origins lie in the fascinating crux between genes and the environment. "Autism is primarily genetic, but something beyond genes is also involved," says pediatric neurologist Andrew Zimmerman, M.D., an associate professor of neurology at Johns Hopkins University School of Medicine