Does having a sibling with autism affect a child’s language and motor skills?
A review of published studies suggests that infants who have siblings with autism spectrum disorder may have less advanced linguistic and motor skills than siblings of children with typical development.
These differences were detectable when infants were 12 months old and seemed to be sustained until they were 3 years old. Differences in language skills were larger than those in motor skills.
The findings are published in Autism Research.