2009, A Balasubramanian, J Koontz, C A Reynolds, “Genetics and Inheritance”, in Janette B. Benson, Marshall M. Haith, editors, Language, Memory, and Cognition in Infancy and Early Childhood, Kidlington: Academic Press, →ISBN, page 184:
When females receive an extra X chromosome, this can result in triple X or 47, XXX. Physical and behavioral features vary but may include increased height and risk of cognitive disabilities, particularly involving speech and language. One in 1000 girls is born with triple X.
