May also be called: Klinefelter Syndrome; XXY Condition
XXY syndrome, also called Klinefelter syndrome, is a fairly common genetic condition found only in males that happens when a boy is born with an extra sex chromosome in most or all of his cells.
Genetic material, or DNA, is contained in tiny structures called chromosomes that are found inside the body's cells. A person's gender is determined by the sex chromosomes: females have two X chromosomes, or XX; most males have one X chromosome and one Y chromosome, or XY. Males with XXY syndrome are born with cells that have an extra X chromosome, or XXY. This can cause delayed development and puberty, a smaller penis and testicles, infertility, and other symptoms.
The condition that causes XXY syndrome is present at birth and can't be changed, but educational treatments and various types of therapy (physical, speech, behavioral, mental health, and occupational) can help boys keep pace in school and overcome problems with shyness and social development.
Kids and teens with XXY syndrome sometimes have trouble fitting in with kids their own age. With early intervention, in adulthood most will have normal social relationships with friends, family members, coworkers, and others.
All A to Z dictionary entries are regularly reviewed by KidsHealth medical experts.
|Genetic Science Learning Center (GSLC) GSLC is a joint project of the University of Utah Eccles Institute of Human Genetics and School of Medicine and the Utah Museum of Natural History, which helps people understand how genetics affect their lives and society.|
|American Academy of Pediatrics (AAP) The AAP is committed to the health and well-being of infants, adolescents, and young adults. The website offers news articles and tips on health for families.|
|Human Growth Foundation The Human Growth Foundation is a resource for kids and teens with growth problems.|
|American Academy of Family Physicians This site, operated by the American Academy of Family Physicians (AAFP), provides information on family physicians and health care, a directory of family physicians, and resources on health conditions.|
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|Word! Chromosomes Your body is made up of billions of cells, which are too small to see without a strong microscope.|
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