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Rett's Disorder

Rett's Disorder (also referred to as Rett's syndrome) is one of the five pervasive developmental disorders described in the diagnostic manual published by the American Psychiatric Association. The term is used to describe female children who: Have apparently typical prenatal and perinatal development, average head circumference at birth and regular psychomotor development for the first five months of life. This period of regular development is followed by a: deceleration in head growth between the age of 5 months and 46 months loss of purposeful hand skills and an increase in stereotypic hand movements between the age of 5 months and 30 months loss of social engagement (this may develop again later) poor coordination and trunk movements severe problems with receptive and expressive language.

Source: Diagnostic and Statistical Manual of Mental Disorders (DSM-IV or DSM-IV-TR)
http://education.qld.gov.au/curriculum/learning/students/disabilities/resources/information/asd/asd6.html