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  2. Down Syndrome: Causes, Symptoms, Diagnosis, & Treatment

    People with Down syndrome have an extra chromosome that impacts how a person looks and their ability to think, learn, and reason. Find out the type, causes, and kinds of effects it can have.

  3. Down syndrome - Wikipedia

    Down syndrome (DS or DNS), also known as trisomy 21, is a genetic disorder caused by the presence of all or part of a third copy of chromosome 21.

  4. What Is Down Syndrome? Facts, Causes, Symptoms

    Down syndrome is a condition caused by chromosome replication errors. A baby born with Down syndrome may have symptoms such as unusual facial features, low IQ, and difficulty learning to walk and crawl.

  5. Down syndrome - Genetics Home Reference - NIH

    Down syndrome is a chromosomal condition that is associated with intellectual disability, a characteristic facial appearance, and weak muscle tone (hypotonia) in infancy. All affected individuals experience cognitive delays, but the intellectual disability is usually mild to moderate. People with ...

  6. Down syndrome - Symptoms and causes - Mayo Clinic

    Down syndrome is a genetic disorder caused when abnormal cell division results in extra genetic material from chromosome 21.

  7. Down Syndrome - KidsHealth

    Down syndrome is a condition in which extra genetic material causes delays in the way a child develops, both physically and mentally.

  8. Down syndrome is the most common genetic condition in the United States. We’ll explain the causes, symptoms, and outlook of this condition.

  9. Down Syndrome | Birth Defects | NCBDDD | CDC

    What is Down Syndrome? Down syndrome is a condition in which a person has an extra chromosome. Chromosomes are small “packages” of genes in the body.

  10. Down Syndrome: MedlinePlus

    About 1 in 700 babies are born with the birth defect known as Down Syndrome. Learn about the different Down Syndrome types and related health issues.

  11. The leading human rights organization for all individuals with Down syndrome.

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