Rett's disorder

Symptoms:

• the child's head growth becomes slowed (deceleration in head circumference)
• loss of previously acquired hand skills
• loss of social engagement (the child no longer wants to interact with others)
• poorly coordinated gait and trunk movements
• difficulty expressing and understanding language (severely impaired expressive and receptive language development)
• severe psychomotor retardation

Signs and tests:

Repeated examinations over time shows that the child was developing normally at first, then the development became severely slowed.