What is Triple X Syndrome?

Triple X syndrome is a congenital chromosomal abnormality affecting one in 800 women, in which three X chromosomes are present instead of the normal two in a woman. These women usually appear totally normal, have normal fertility, their children are genetically normal, and their life span is normal. If symptoms do appear, they may include:

• Tall stature
• Small head (microcephaly)
• Vertical skinfolds that may cover the inner corners of the eyes (epicanthal folds)
• Delayed development of certain motor skills, speech and language
• Infertility (rare).