Rett syndrome is a rare genetic neurological disorder that mostly affects girls, with an incidence of 1 in 12,000 female births per year. It was first recognized in the 1960s and in 1999 a mutation in the MECP2 gene was discovered as the cause. It is characterized by normal early development followed by a loss of purposeful hand skills and spoken language between 1 to 4 years of age, accompanied by distinctive hand movements, slowed brain and head growth, problems walking, seizures, and intellectual disability. Diagnosis is based on symptoms and genetic testing can confirm a MECP2 mutation. There is no cure, but treatment focuses on management of symptoms, physical, occupational, and speech therapy, nutrition, and supportive care