Autistic Disorder
A pervasive developmental disturbance with onset before age three, characterized by markedly abnormal or impaired development in social interaction and communication and a markedly restricted array of activity and interests. Manifestations of the disorder vary greatly depending on the developmental level and age of the individual. Autistic children can be withdrawn and show little interest in others or in typical childhood activities and instead exhibit repetitive and stereotyped patterns of behavior, interests and activities.
Source: Children Welfare Information Gateway
