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Pervasive developmental disorder
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:
- Pervasive disorder not otherwise specified (PDD-NOS)
- Asperger Syndrome
- Rett syndrome
- Childhood disintegrative disorder (CDD).
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.
- National Dissemination Center for Children with Disabilities (NICHCY) (October 2003) Disability Info: Pervasive Developmental Disorders (FS20). Fact Sheet 20 (FS20)