A birth defect that occurs more frequently in babies born to mothers over the age of 35 is

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Down syndrome is a genetic condition caused by the presence of an extra chromosome 21. The likelihood of a baby being born with Down syndrome increases with the mother's age, especially after the age of 35. This is because older eggs are more likely to divide incorrectly, leading to the development of an extra chromosome.

A Birth Defect That Occurs More Frequently in Babies Born