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Disintegrative Disorders

Childhood Disintegrative Disorder (CDD) Childhood disintegrative disorder is one of the five pervasive developmental disorders described in the diagnostic manual published by the American Psychiatric Association. The disorder is characterized by: typical development for the first two years of life, with appropriate verbal and non-verbal communication skills, social relationships, play and adaptive behaviors. a clinically significant loss of previously acquired skills (before 10 years of age) in at least two of the following areas: expressive or receptive language social skills or adaptive behavior bowel or bladder control play motor skills difficulties in social interaction, communication and patterns of behavior best described as repetitive, restricted and stereotypic.

Source: Diagnostic and Statistical Manual of Mental Disorders (DSM-IV or DSM-IV-TR)
http://education.qld.gov.au/curriculum/learning/students/disabilities/resources/information/asd/asd6.html

Yale Child Study Center
http://info.med.yale.edu/chldstdy/autism/cdd.html