Probably "Rett Syndrome" - is a neurodevelopmental disorder that is classified as a pervasive developmental disorder by the DSM-IV. The clinical features include a deceleration of the rate of head growth and small hands and feet. -wikipedia

Rett syndrome is a childhood neurodevelopmental disorder that affects females almost exclusively. Loss of muscle tone is usually the first symptom. Other early symptoms may include problems crawling or walking and diminished eye contact. As the syndrome

progresses, a child will lose purposeful use of her hands and the ability to speak. Compulsive hand movements such as wringing and washing follow the loss of functional use of the hands. The inability to perform motor functions is perhaps the most severel

y disabling feature of Rett syndrome, interfering with every body movement, including eye gaze and speech.