Pervasive developmental disorders (PDD), as opposed to specific developmental disorders (SDD), refers to a group of five disorders characterized by delays in the development of multiple basic functions including socialization and communication. The pervasive developmental disorders are:
* Autism, the most commonly known,
* Rett syndrome,
* Childhood disintegrative disorder,
* Asperger syndrome, and
* Pervasive developmental disorder not otherwise specified (PDD-NOS), which includes atypical autism.
Parents may note symptoms of PDD as early as infancy and typically onset is prior to three years of age. PDD itself does not affect life expectancy.
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