Pervasive development disorders (PDDs) include autistic disorder, Rett's syndrome, and Asperger's syndrome.

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Children diagnosed with PDD differ widely in abilities, intelligence, and behaviors. Principal characteristics of PDDs are severe impairments in several areas of development, including communication and social interaction skills. The disorders can include particular behaviors that cause the failure to develop peer relationships and interactions with others, including lack of nonverbal communication and lack of reciprocation of emotions. This impairment is related directly to the person's developmental level or mental age. A category of disorders is referred to as autism spectrum, encompassing the broad group of developmental delays and disorders having an effect on social communication skills and possibly to a larger or smaller degree, motor and language skills. The following are the disorders listed as pervasive development-type disorders: autism, pervasive developmental disorder not otherwise specified, Rett's syndrome, childhood disintegrative disorder, and Asperger's syndrome.

Pervasive Development Disorders (PDDs) Include Autistic Disorder, Rett's Syndrome, and Asperger's