Childhood Disintegrative DisorderChildhood disintegrative disorder (CDD) is classified as a pervasive developmental disorder and is characterized by at least 2 years of normal early development followed by profound loss of previously acquired skills in the areas of cognition, communication, motor control, and bowel and bladder control. Once established, behaviors manifested as a result of CDD are indistinguishable from those of autism. Previously, CDD has been referred to as Heller’s syndrome, dementia infantilis, and disintegrative psychosis (Filipek et al.,).