Relation between early motor delay and later communication delay in infants at risk for autism

BackgroundMotor delays have been reported in retrospective studies of young infants who later develop Autism Spectrum Disorders (ASDs).ObjectiveIn this study, we prospectively compared the gross motor development of a cohort at risk for ASDs; infant siblings of children with ASDs (AU sibs) to low risk typically developing (LR) infants.Methods24 AU sibs and 24 LR infants were observed at 3 and 6 months using a standardized motor measure, the Alberta Infant Motor Scale (AIMS). In addition, as part of a larger study, the AU sibs also received a follow-up assessment to determine motor and communication performance at 18 months using the Mullen Scales of Early Learning.ResultsSignificantly more AU sibs showed motor delays at 3 and 6 months than LR infants. The majority of the AU sibs showed both early motor delays and later communication delays.LimitationsSmall sample size and limited follow-up.ConclusionsEarly motor delays are more common in AU sibs than LR infants. Communication delays later emerged in 67–73% of the AU sibs who had presented with early motor delays. Overall, early motor delays may be predictive of future communication delays in children at risk for autism.

► Motor development of infants at risk for ASDs and low risk infants was compared.
► In the at-risk infants, communication development was also assessed at 18 months.
► At-risk infants showed both early motor and later communication delays.
► Motor delays predict future communication delays in children at risk for autism.