Autism-World

All of the following:

apparently normal prenatal and perinatal development
apparently normal psychomotor development through the first five months after birth
normal head circumference at birth

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 [...]

RTT
RTS Rett’s Syndrome
Cerebroatrophic Hyperammonemia
??Autism-Dementia-Ataxia-Loss of Purposeful Hand Use Syndrome

Early Onset Phase ??¡° Development stalls or stops.
Rapid Destructive Phase ??¡° The child loses skills (regresses) quickly.?? Purposeful hand movements and speech are usually the first skills lost.
Plateau Phase ??¡° Regression slows, and other problems may seem to lessen or improve. Most people with Rett syndrome spend most of their lives in stage 3.
Late Motor [...]

After appearing to make normal progress, a period of stagnation in development from about the end of the first year, which lasts until regression occurs.
Loss of purposeful hand movements, such as grasping with fingers, reaching for things, or touching things on purpose.
Balance and coordination problems, including losing the ability to walk in many cases
??A regression [...]