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Is childhood disintegrative disorder a form of autism?

Updated: 8/20/2019
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Childhood Disintegrative Disorder (CDD) has several characteristics of autism involving developmental regression in communication and motor skills, but doesn't share the exact same framework of autism. CDD represents a much more drastic loss of skills, and occurs at an older age than autism. Classic autism typically occurs between 15-30 months of age, when kids learn to speak, walk, and eat with utensils. CDD typically doesn't occur until 3-4 years of age, thus affected kids may have been toilet trained, and learned everything they should up to that age, and then their developmental trajectories suddenly stop and reverse cycle, going all the way back to infantilism;diapers, nonveral, etc. CDD is much more related to profound mental retardation than typical autism. It's also much less common than autism. Autism affects about 1 in 150 children, and CDD affects about 1 in 100,000 children.

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Q: Is childhood disintegrative disorder a form of autism?
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