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Autism Resource Network of Northwest Michigan
 

Diagnostic Criteria for 299.80 Rett's Disorder


A. All of the following:
     1.  apparently normal prenatal and perinatal development
    
     2.  apparently normal psychomotor development through the first 5              months after birth
     3.  normal head circumference at birth

B.  Onset of all of the following after the period of normal development:
     1.  deceleration of head growth between ages 5 and 48 months
    
     2.  loss of previously acquired purposeful hand skills between 5 and 30        months with the subsequent development of stereotyped hand                    movements (e.g., hand-wringing or hand washing)

     3.  loss of social engagement early in the course ( although often social      interaction develops later)
 
     4.  appearance of poorly coordinated gait or trunk movements

     5.  severely impaired expressive and receptive language development          with severe psychomotor retardation

 
 

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