Children who have an older sibling with autism have a higher risk of developing the disorder themselves than those who have no siblings with the disorder. This fact can leave the parents of those at risk on the lookout for symptoms. But how well do parental concerns match up with a child’s actual behavior? Not so well, according to a study published 24 February in the Journal of Autism and Developmental Disorders. Researchers asked more than 3,000 mothers to keep diaries chronicling their infants’ first year of life. Although mothers of high-risk ‘baby sibs’ were more likely to pen concerns about language, social skills and repetitive behaviors than were mothers of babies at average risk, their reports overstated their children’s behavior problems during infancy.