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Know About Autism and Pervasive Developmental Disorders

The term pervasive developmental disorders (PDDs) refers to a group of developmental conditions that involve delayed or impaired communication and social skills, behaviors, and cognitive skills (learning). Because autism is the best-known of the PDDs, the disorders also are known as autism spectrum disorders (ASDs). PDDs include Asperger syndrome and two less common conditions, childhood disintegrative disorder and Rett syndrome. PDDs usually are diagnosed during infancy,
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