DS Facts: How common is Down Syndrome?

Down syndrome occurs worldwide, and its incidence varies by region and maternal age.

According to the World Health Organization, the estimated incidence of Down syndrome is between 1 in 1,000 to 1 in 1,100 live births worldwide.

However, the incidence is higher among children born to mothers who are 35 years or older. In the United States, about 1 in every 700 babies born has Down syndrome.

Down syndrome is the most common chromosomal disorder, and it affects people of all races and ethnicities. (source: WHO)

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