Autistic Disorder and Asperger's Disorder are the two most common forms of the Autism Disorders Spectrum (ASD) Children with these disorders have difficulty in accomplishing developmental tasks entailing social language, communication and socialization. The diagnosis of Autistic Disorder is generally made between birth and thirty months of age, whereas the diagnosis of Asperger's Disorder is generally made later in a child's life. Although the disorder is present from birth, some youngsters may not be diagnosed until they enter school or some may have been given another diagnosis because they are developing normally in some areas of life.

These disorders appear to have a genetic cause. Treatment can include a combination of medications and specialized training to develop and improve acquisition of necessary skills.