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If maternal age over 35 years is a risk factor for having babies with DS, why are more than half of all babies with DS born to women under 35 years?

April 26, 2017age babies DS Factor Half Maternal risk

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If maternal age over 35 years is a risk factor for having babies with DS, why are more than half of all babies with DS born to women under 35 years?

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While it is much more common for babies with DS to be born to women over 35 years of age (see my risk page), women under 35 have a higher birth rate. No risk factors have been found yet for women under 35 years of age, but several research groups are looking at this question.