Written by Pam MS, NCSP | Fact checked by Psychology Dictionary staff 

Especially presenting in female children, a degenerative disorder which becomes apparent between six and eighteen months of age wherein the child experiences swift regression of skills, including cognitive, motor, and social skills. Subsequent stabilization occurs at a level which renders the child mentally disabled.

RETT SYNDROME: "Rett syndrome is characterized by hand-wringing motions, loss of skills, and autistic features."

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