Infantile autism is a developmental disability characterized by onset of disturbances in social and language development before the age of 30 months. It must be distinguished from several disorders, including mental retardation and schizophrenia. Most evidence supports an organic basis for the syndrome. Treatment consists of training in language and communication skills, behavioral modification and, occasionally, chemotherapy. Supportive counseling and education for parents are vital to treatment. The prognosis for achieving a life of complete independence is poor.