Signs and Symptoms of Klinefelter Syndrome

According to the U.S. National Library of Medicine, Klinefelter syndrome is a condition that adds an extra X-chromosome to a male's genetic make-up. Klinefelter syndrome is only found in males, and it occurs in approximately 1 in every 500 American males.

Motor Skills

• The added X-chromosome may slow motor development in male children, causing delays in crawling and walking.

Infertility

• According to Medicinenet.com, nearly 99 percent of the males afflicted with Klinefelter syndrome are infertile because they are unable to produce an adequate amount of sperm.

Appearance

• Males with Klinefelter syndrome tend to be taller and grow less facial hair than males without the condition. Klinefelter syndrome can also increase the probability that these males will develop a weight problem as they age.

Breast Symptoms

• Klinefelter syndrome can cause the male's breasts to become tender to the touch, and it can also increase the odds of breast cancer.

Intellectual Development

• Males with Klinefelter syndrome tend to take longer to learn to read and write. They display normal levels of intelligence, but these levels develop later.