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DSM-IV Diagnostic Criteria
PERVASIVE DEVELOPMENTAL DISORDERS
- 299.80 Rett's Disorder
- (A)
- All of the following:
- apparently normal prenatal and perinatal development
- apparently normal psychomotor development through the first 5 months after birth
- normal head circumference at birth
- (B)
- Onset of all of the following after the period of normal development:
- deceleration of head growth between ages 5 and 48 months
- loss of previously acquired purposeful hand skills between ages 5 and 30 months with the
subsequent development of stereotyped hand movements (e.g., hand-wringing or hand washing)
- loss of social engagement early in the course (although often social interaction
develops later)
- appearance of poorly coordinated gait or trunk movements
- severely impaired expressive and receptive language development with severe psychomotor
retardation
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