Autism Characteristics by Age Chart
In some children, signs appear as early as age 6 months. In others, signs appear as late as 24-30 months. This chart lists the behavioral features and symptoms that may be observed in a child with autism spectrum disorder.
AUTISM CHARACTERISTICS BY AGE *In some children, signs appear as early as age 6 months. In others, signs appear as late as 24-30 months. BEHAVIORAL FEATURES Response to others’ social input OBSERVABLE AT 6-12 MONTHS Poor eye contact OBSERVABLE AT 12-30 MONTHS Poor eye contact Infrequent or delayed response when name is called Inattentive to others’ pointing or eye direction cues Infrequent playful imitation of others’ actions Shows little interest in other children Social interaction Passive Limited facial expression during social interaction Infrequent smiling at others with eye contact Infrequent attempts to point out or show objects or events of own interest Limited facial expression during social interaction Infrequent smiling at others to show enjoyment Rarely initiates social smiles to share enjoyment Communication and play Delayed babbling Limited exploration of toys and objects Low variety of speech sounds or gestures when trying to communicate Delayed language development Limited variety of play with toys Infrequently coordinates eye contact with gestures and speech sounds to communicate Sensory and motor Tenses hands, arms, legs or mouth Low muscle tone, ‘floppy’ Poor motor coordination or motor delay (sitting, crawling) Seeks firm pressure on body Intense interest in shiny or moving things Tenses hands, arms, legs or mouth Poor motor coordination or motor delay Seeks firm pressure on body Intense interest in shiny or moving things Source: Kennedy Krieger Institute research studies Landa, RJ (2008) Nature Clinical Practice Neurology, 4:138-147; Sullivan M, Finelli J, Marvin A, Garrett-Mayer E, Bauman M, & Landa R. (2007) J of Autism and Developmental Disorders, 37:37-48; Flanagan J & Landa R. (2007) American Occupational Therapy Association Annual Conference; Bhat A, Galloway C, & Landa R. (2007) Society for Research in Child Development Conference; Landa R, Holman K, & Garrett-Mayer E. (2007) Archives of General Psychiatry, 64: 853-864; Landa R & Garrett-Mayer E. (2006). J of Child Psychology and Psychiatry, 47: 629-638.