Rebecca Ellis does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond ...

Stereotypic movement disorder is a motor disorder that develops in childhood, typically before grade school, and involves repetitive, purposeless movement. Examples of stereotypic movements include ...

Rett syndrome affects girls almost exclusively, occurring in 1 of every 10,000 to 15,000 births and usually diagnosed by age 2. It is characterized by developmental regression, autistic traits, slow ...