Rett syndrome is a rare genetic disease that causes developmental and nervous system problems, mostly in girls. It's related to autism. Babies with Rett syndrome seem to grow and develop normally at first. Between 3 months and 3 years of age, though, they stop developing and even lose some skills. Symptoms include
Rett syndrome has no cure. You can treat some of the symptoms with medicines, surgery, and physical and speech therapy. Most people with Rett syndrome live into middle age and beyond. They will usually need care throughout their lives.
NIH: National Institute of Child Health and Human Development