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Pervasive developmental disorder (PDD) refers to a group of disorders characterized by delays in the development of socialization and communication skills. Parents may note symptoms as early as infancy, although the typical age of onset is before three years of age. The types of PDD are: autism, asperger syndrome, rett syndrome, childhood disintegrative disorder and pervasive developmental disorder. General symptoms that may be present to some degree in a child with a PDD include: Difficulty with verbal communication, including problems using and understanding language. Difficulty with non-verbal communication, such as gestures and facial expressions. Difficulty with social interaction, including relating to people and to his or her surroundings. Unusual ways of playing with toys and other objects. Difficulty adjusting to changes in routine or familiar surroundings. Repetitive body movements or patterns of behavior, such as hand flapping, spinning, and head banging. Changing response to sound. (The child may be very sensitive to some noises and seem to not hear others.) Temper tantrums Difficulty sleeping Aggressive behavior Fearfulness or anxiety