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  • group of disorders characterized by delays in the development of socialization and communication skills; typical age of onset is before 3 years of age; symptoms may include problems with using and understanding language; difficulty relating to people, objects, and events; unusual play with toys and other objects; difficulty with changes in routine or familiar surroundings, and repetitive body movements or behavior patterns; AUTISM is the most characteristic and best studied PDD; other types of PDD include ASPERGER SYNDROME, Childhood Disintegrative Disorder, and RETT SYNDROME; prefer NTs where possible.
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