Childhood disintegrative disorder and autism are among several developmental disorders known as pervasive developmental disorders or autism spectrum disorders. This mayo clinic site shows this and so much more about childhood disintegrative disorder.

An excellent article from the Mayo Clinic about Childhood Disintegrative Disorder, which is part of ASD. CDD is sometimes confused with late onset Autism. This article covers what CDD is, how it's diagnosed, the symptoms, causes, treatment and more. It's a very well written and easy to read article.