Closely Spaced Pregnancies Linked to Increased Autism Risk - ABC News

Closely Spaced Pregnancies Linked to Increased Autism Risk - ABC News: "The rising prevalence of autism in the United States suggests that environmental risk factors growing in prominence are at play. New research adds to a growing body of evidence that the risk is conferred well before affected children show symptoms, such as impairments in communication and social interaction -- during pregnancy."