Rett syndrome is a genetic disorder that typically becomes apparent after 618 months of age and almost exclusively in girls. Symptoms include impairments in language and coordination, and repetitive movements.
Brynn is diagnosed with Rett syndrome and considered nonverbal.

With Rett, individuals experience a loss of coordination, which affects various motor functions and skills, says Eliza Gunner, a pediatric occupational therapist who is also at the Rett Syndrome Clinic Center of Excellence at University of North Carolina School of Medicine in Chapel Hill.

Rett syndrome can also cause seizures and intellectual disabilities. Unusual hand movements, such as repetitive rubbing or clapping, replace purposeful hand use. Although there's no cure for Rett syndrome, potential treatments are being studied.

Rett syndrome is a neurodevelopmental disorder found almost exclusively in women characterized by the loss of language and motor skills. Learn more at Montefiore Einstein.
Rett syndrome (RS) is a neurodevelopmental disorder first reported in 1966 by Andreas Rett, an Austrian pediatric neurologist. It occurs almost exclusively in females and has a typically degenerative course.
Living with Rett Syndrome: Lifespan, Quality of Life, and Family Impact. Life expectancy in Rett syndrome is reduced compared to general population but many individuals live into their forties, fifties, or even sixties with good care.