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Pervasive developmental disorder

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Pervasive developmental disorders (PDD) are a group of disorders. There are five disorders in the group. These disorders all slow down the rate a child learns to talk and listen to others, as well as cause other problems.

The five disorders are:[1]

The first three of these disorders are also called autism spectrum disorders. The last two are not common.

A child's parents might begin to notice signs of PDD when the child is a baby, and it usually appears before the child is three years old.


  1. National Dissemination Center for Children with Disabilities (NICHCY) (October 2003) Disability Info: Pervasive Developmental Disorders (FS20). Fact Sheet 20 (FS20)