Breit (eds.): Klinefelter's syndrome.

Although most boys with Klinefelter Syndrome grow up to live as men, some do develop atypical gender identities, and some do develop female gender identities.

Boys with Klinefelter's syndrome are usually quite normally developed at birth.

It is of course up to the parents to decide whether they want to have a son with Klinefelter's syndrome or have an induced abortion after prenatal chromosome examination at least in a country with free abortion like Denmark.


(1987): Klinefelter's syndrome in childhood, adolescence and youth.

It is also important to tell the fact that the relationship between adoptive parents and their children is as good as between biological parents and their children, and one should stress that males with Klinefelter's syndrome have as normal sexual and marital relations as others.


Klinefelter’s syndrome | XXY4Life

This is important for many reasons, but especially because it makes it possible for them to create the best possible conditions for their son with Klinefelter's syndrome with maximum stimulation in all aspects and with incitement to independence and maturity, trying to avoid overprotection and infantilising.

Tagged Klinefelter's syndrome, XXY

It is very important that parents get as much knowledge as possible about Klinefelter's syndrome as early as possible in the life of their son and preferably already from the date of birth.

I Have Klinefelter Syndrome | Support Group with …

1. Klinefelter syndrome may affect up to 1 in 500 male births in the world today.
2. A recent Danish study indicated that Klinfelter syndrome was present in 153 per 100,000 babies tested.
3. An estimated 53-55% of conceptions affected with Klinefelter syndrome are expected to survive to term.
4. KS was first described in 1942 as an endocrine disorder.
5. Approximately 5% of Klinefelter syndrome cases detected at amniocentesis resulted in fetal deaths, which is similar to other disorders that are not chromosomal in nature.
6. Approximately 80% of Klinefelter cases possess the 47XXY karyotype.
7. The residual 20% of cases have higher-grade chromosome aneupolidies [48XXYY] or mosaicism [46XY/47XXY].
8. Individuals with mosaic-type Klinfelter syndrome have less severe symptoms than others with this disorder.
9. Variants of Klinefelter syndrome that include multiple X chromosomes being passed along are much rarer, occurring in just 1 in 50,000 births.
10. Klinefelter syndrome is not an inherited disorder. It can occur from sperm or egg development or occurs as a random division.
11. Men with this disorder have a higher risk than men in the general population for the development of breast cancer.
12. 10%. That’s the number of boys who have this disorder and also have a diagnosis that places them on the autism spectrum.
13. There is generally less than a 1% chance for other children in the family to be diagnosed with Klinefelter syndrome is one child has it already.
14. In many cases, there are no signs or features during pregnancy that indicate a developing baby has Klinefelter syndrome.
15. There is a slightly increased risk for boys with Klinefelter syndrome to also be born with a mild birth defect.
16. By the age of 8, children with Klinefelter are, on average, taller than 60% of children their same age.
17. Men with this disorder also tend to have longer legs, more narrow shoulders, wider hips, and a longer arm span when compared to men with the normal number of chromosomes.
18. Life expectancy for people with Klinefelter syndrome is normal.
19. The percentage of cases of Klinefelter syndrome that are believed to be undiagnosed right now: 50%.
20. Some men with an extra X chromosome have fathered healthy offspring, sometimes with the help of infertility specialists.
21. Women who have pregnancies after age 35 have a slightly increased chance of having a boy with this syndrome.
22. About half of the time the error which causes this syndrome occurs in the formation of sperm, while the remainder are due to errors in egg development.
23. A rare tumor called extragonadal germ cell tumor, lung disease, varicose veins, and osteoporosis are all at a higher risk for men with KS than for those in the general population.
24. The most common form of treatment for this disorder is testosterone therapy as it promotes strength, the development of muscles, and the growth of body hair.
25. Boys with KS may have an IQ that may be 10-15 points lower than average with verbal IQ less than performance IQ.

May 18, 2015 · Do You Have Klinefelter Syndrome


For boys with Klinefelter's syndrome, who grow up in a good environment and who have got the love, support and stimulation they need as well as hormone treatment and information, there will be no increased risk of mental disorders.