The major feature which distinguishes child disintegrative disorder from autism is

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Child disintegrative disorder (CDD), also known as Heller's syndrome, is characterized by a normal developmental period followed by a significant regression in multiple areas of functioning, including language, social skills, and adaptive behavior. This regression typically occurs between the ages of 2 and 10, and is not seen in autism where symptoms are present from early childhood. Therefore, the major feature which distinguishes child disintegrative disorder from autism is later onset, after several years of normal development.

The Major Feature Which Distinguishes Child Disintegrative Disorder from Autism