Pervasive developmental disorder

Pervasive developmental disorders (PDD) are a group of disorders characterized by delays in the development of socialization and communication skills. These disorders are present at birth, but the signs of the disorders usually are noticed during a child's first 3 years of life.

Pervasive developmental disorders include autism, Rett's disorder (or syndrome), Asperger's syndrome (or disorder), childhood disintegration disorder (CDD), and pervasive developmental disorders not otherwise specified (PDD-NOS).

The severity of pervasive developmental disorders varies by individual. Treatment for these disorders includes behavioral training, speech and occupational therapy, and parent education and support.