A pediatric disorder characterized by normal development for at least the first two years of life followed by a severe regression in language, social interaction, bowel or bladder control, and/or motor skills. the affected individual may also exhibit repetitive and stereotyped patterns of behavior similar to autism.

Childhood disintegrative disorder (CDD), also known as Heller syndrome and disintegrative psychosis, is a rare condition characterized by late onset of developmental delays—or severe and sudden reversals—in language (receptive and expressive), social engagement, bowel and bladder, play and motor skills. Researchers have not been successful in finding a cause for the disorder...