Down syndrome (or Trisomy 21) is a naturally occurring chromosomal arrangement that has always been a part of the human condition.
Down syndrome is universally present across racial, gender or socioeconomic lines in approximately 1 in 800 live births, although there is considerable variation worldwide.
Down syndrome usually causes varying degrees of intellectual and physical disability and associated medical issues.
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People with Down syndrome answer your questions about Down syndrome. Read more
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