Triple X syndrome is an abnormality of the chromosomes that affects about 1 in 1,000 females. In triple X syndrome, a female has three X chromosomes ? hence, the name.
Triple-X syndrome is listed as a "rare disease" by the Office of Rare Diseases (ORD) of the National Institutes of Health (NIH). Approximately 0.10% or 1 per 1,000 newborn girls suffer from triple X syndrome.
While the extra X chromosome can of course never be removed, early intervention, such as speech or physical therapy, can help, as well as counselling as girls enter adolescence.
Research in this field increased as the genetic mechanisms of the syndrome are understood to the full extent permitted by modern genetic tools and understanding.