Data and Statistics on Down Syndrome. Centers for Disease Control and Prevention. (2022, December 16). https://www.cdc.gov/ncbddd/birthdefects/downsyndrome/data.html 

CDC: Data and Statistics on Down Syndrome

Tulane University

The prevalence of giving birth to a baby with Down syndrome is significantly higher in older women (over the age of 35) because as a woman ages, the probability that one of her eggs will contain an excess copy of the 21st chromosome increases greatly. Nearly ½ of babies with Down syndrome are born to women over the age of 35 every year in the United States. 

The Age of the Mother

Since pregnant women's average age increased during this time frame, the number of children born with Down Syndrome also increased since occurrence of down syndrome is more likely when the mother is older. However, with such increase in age, more elective pregnancy terminations occurred from 2006 to 2010.

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