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down syndrome

down syndrome is a genetic condition caused by abnormal cell division in the egg, sperm, or fertilized egg. this results in an extra or irregular chromosome in some or all of the body's cells, causing varying levels of intellectual disability and physical problems.

down syndrome is also called trisomy 21, for the specific chromosome that has the abnormality. a person with down syndrome has three copies of chromosome 21. normally, a person has two copies.

down syndrome usually can be detected during pregnancy or soon after birth. chromosome tests and how a baby looks can help make a diagnosis.

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this information does not replace the advice of a doctor. healthwise, incorporated, disclaims any warranty or liability for your use of this information. your use of this information means that you agree to the terms of use and privacy policy. to learn more about healthwise, visit healthwise.org. © 1995-2022 healthwise, incorporated. healthwise, healthwise for every health decision, and the healthwise logo are trademarks of healthwise, incorporated.

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