![]() Parents may note symptoms of PDD as early as infancy and typically onset is prior to 3 years of age. ![]() ![]() The most commonly known PDD is (1) Autism, with the remaining identified as (2) Rett syndrome, (3) Childhood disintegrative disorder, (4) Asperger syndrome, and (5) Pervasive Developmental Disorder Not Otherwise Specified (or PDD-NOS). The diagnostic category 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. Pervasive developmental disorder Classification & external resources ICD-10 Unsourced material may be challenged and removed. Please help improve this article by adding reliable references. This article needs additional citations for verification.
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