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  • What causes Down syndrome? | NICHD - NICHD - Eunice Kennedy Shriver . . .
    Down syndrome is caused by a random error in cell division that results in the presence of an extra copy of chromosome 21 The type of error is called nondisjunction
  • Down syndrome - Symptoms and causes - Mayo Clinic
    It's the most common genetic chromosomal cause of intellectual disabilities in children It also commonly causes other medical conditions, including heart and digestive system problems
  • Down Syndrome | Birth Defects | CDC
    When babies are growing, the extra chromosome changes how their body and brain develop This can cause both physical and mental challenges People with Down syndrome often have developmental challenges, such as being slower to learn to speak than other children
  • Down Syndrome: Causes, Symptoms, Diagnosis, and Treatment - WebMD
    Down syndrome is a genetic condition that causes mild to significant physical and developmental problems People with Down syndrome (DS) are born with an extra chromosome Chromosomes are
  • Facts, Myths, Truths About Down Syndrome - NDSS
    Down syndrome occurs when an individual has a full or partial extra copy of chromosome 21 This additional genetic material alters the course of development and causes the characteristics associated with Down syndrome
  • Down syndrome - Wikipedia
    Down syndrome or Down's syndrome, [12] also known as Trisomy 21, is a genetic disorder caused by the presence of all or part of a third copy of chromosome 21 [3] It is usually associated with developmental delays, mild to moderate intellectual disability, and characteristic physical features [1][13]
  • Down Syndrome | Nemours KidsHealth
    In most cases of Down syndrome, a child gets an extra chromosome 21 — for a total of 47 chromosomes instead of 46 Rarely, the extra chromosome 21 attaches to another chromosome This extra genetic material causes the physical features and developmental delays in people with Down syndrome
  • Down Syndrome: Causes, Types, and Symptoms - Healthline
    Down syndrome is the most common genetic condition in the United States We’ll explain the causes, symptoms, and outlook of this condition
  • Down Syndrome Risk Factors and Causes - Parents
    Here are four factors that may be associated with an increased risk of having a baby with Down syndrome Down syndrome can occur in children conceived by parents of any age, but the
  • Down Syndrome Causes and Risk Factors - Everyday Health
    Down syndrome is a genetic condition that an individual is born with Here’s what’s happening in an individual’s DNA that causes the disorder and what’s known about the risk factors that





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