Rett syndrome: MedlinePlus Genetics

Rett syndrome is a brain disorder that occurs almost exclusively in girls. The most common form of the condition is known as classic Rett syndrome. After birth, girls with classic Rett syndrome have 6 to 18 months of apparently normal development before developing severe problems with language and communication, learning, coordination, and …

https://medlineplus.gov/genetics/condition/rett-syndrome/