What is Childhood Disintegrative Disorder?
Children with Childhood Disintegrative Disorder (CDD) develop normally until age 3 or 4 when they start to lose previously acquired social, language and motor skills. This can happen over a period of months. CDD is sometimes called Heller Syndrome and is part of the larger category Autistic Spectrum Disorders. Most children with this condition regress until they have permanent impairment similar to a ten-year-old child with severe autism. The cause of CDD is not known.