A to Z: XXY Syndromeenparentshttps://kidshealth.org/EN/images/headers/P-khAZDictionary-enHD-AR1.jpgLearn genetic disorders and conditions that can affect social and sexual development.klinefelter syndrome, XXY, chromosomes, genetic conditions, sex chromosomes, genetics, Klinefelter's syndrome, infertility, gynecomastia, developmental issues, delayed puberty, emotional problems, sexual development, biological sex01/11/201307/06/202007/06/202081f4e3ec-5372-4fe6-8e7d-01b445d7bc8fhttps://kidshealth.org/ws/RadyChildrens/en/parents/az-xxy.html/<p><em>May also be called:</em> <em>Klinefelter&nbsp;Syndrome; XXY Condition</em></p> <p>XXY syndrome, also called <a href="https://kidshealth.org/ws/RadyChildrens/en/parents/klinefelter-syndrome.html/">Klinefelter syndrome</a>, is a fairly common <a href="https://kidshealth.org/ws/RadyChildrens/en/parents/about-genetics.html/">genetic</a> condition. It happens when a boy is born with an extra sex chromosome in most or all of his cells.</p> <h3>More to Know</h3> <p>Genetic material, or DNA, is contained in tiny structures called chromosomes found inside the body's cells. A person's biological sex 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 <a href="https://kidshealth.org/ws/RadyChildrens/en/parents/understanding-puberty.html/">puberty</a>, a smaller penis and testicles, infertility, and other symptoms.</p> <p>The condition that causes XXY syndrome is present at birth and can't be changed. But educational treatments and various types of therapy (<a href="https://kidshealth.org/ws/RadyChildrens/en/parents/phys-therapy.html/">physical therapy</a>, <a href="https://kidshealth.org/ws/RadyChildrens/en/parents/speech-therapy.html/">speech therapy</a>, behavioral and mental health counseling, and <a href="https://kidshealth.org/ws/RadyChildrens/en/parents/occupational-therapy.html/">occupational therapy</a>) can help someone keep pace in school and overcome problems with shyness and social development.</p> <h3>Keep in Mind</h3> <p>Kids and teens with XXY syndrome sometimes have trouble fitting in with kids their own age. With early help, in adulthood most will have normal social relationships with friends, family members, coworkers, and others.</p> <p><em>All A to Z dictionary entries are regularly reviewed by KidsHealth medical experts.</em></p>
All About GeneticsRead the basics about genetics, including how certain illnesses, or increased risks for certain illnesses, pass from generation to generation.https://kidshealth.org/ws/RadyChildrens/en/parents/about-genetics.html/0a35cfc5-5d12-46d2-b0a9-ffae83cace5c
Delayed PubertyConcerned about your growth or development? Puberty can be delayed for several reasons. Luckily, doctors usually can help teens with delayed puberty to develop more normally.https://kidshealth.org/ws/RadyChildrens/en/teens/delayed-puberty.html/26226dd1-992c-4cb8-aeb0-cb8b61d4fa84
Klinefelter SyndromeBoys with this condition have an extra "X" chromosome that prevents them from developing normally during puberty. But hormone treatments, counseling, and other therapies can help.https://kidshealth.org/ws/RadyChildrens/en/parents/klinefelter-syndrome.html/6698de06-0319-4a67-ad6b-cf494093de8b
The Basics on Genes and Genetic DisordersGenes play an important role in how we look and act, and even in whether we get sick. This article gives the lowdown on genes, genetic disorders, and new research into gene therapy.https://kidshealth.org/ws/RadyChildrens/en/teens/genes-genetic-disorders.html/04ae1bf5-9cc5-4057-96a8-ed7dae4b4891
What Is a Gene?Why does one kid have green eyes while another kid's eyes are brown? It's all in the genes! Find out how genes work, what happens when there are problems with genes, and more.https://kidshealth.org/ws/RadyChildrens/en/kids/what-is-gene.html/94bc3da2-1fa1-4488-8a5c-70e18a4db97a
Word! ChromosomesYour body is made up of billions of cells, which are too small to see without a strong microscope.https://kidshealth.org/ws/RadyChildrens/en/kids/word-chromosomes.html/be7e93cc-e931-4ec4-b1e4-7ff937c6b60d