Describe physical or mental disability of Down syndrome

It is usually associated with physical growth delays, mild to moderate intellectual disability, and characteristic facial features. The average IQ of a young adult with Down syndrome is 50, equivalent to the mental ability of an eight- or nine-year-old child, but this can vary widely.

Symptoms: Delayed physical growth, characteristic facial features, mild to moderate i...

Other names: Down's syndrome, Down's, trisomy 21

Causes: Third copy of chromosome 21

Risk factors: Older age of mother, prior affected child

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