Early communication impairment is among the most-reported first concerns in parents of young children with autism spectrum disorder (ASD). Using a parent-report questionnaire, we derived trajectory groups for early language and gesture acquisition in siblings at high risk for ASD and in children at low risk, during their first 2 years of life.…

The present paper documents the development of autism/autistic spectrum disorder in a consecutive series of nine high-risk infants followed prospectively from 6 months of age. Evidence is provided for two broadly defined subgroups: the first subgroup (n = 6) showed a decrease in IQ between 12 and 24 or 36 months (from average/near average to…

This case study of a toddler with autism whose parents had videotaped her development from birth showed that the child's behavior and development were essentially normal for the first year but that she then became withdrawn in only a few months. It is suggested that early communicative screening tests might have identified the child's earliest…