Merck Manual

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What Is the Risk of Having a Baby With a Chromosomal Abnormality*?

What Is the Risk of Having a Baby With a Chromosomal Abnormality*?

Age of Woman

Risk of Any Chromosomal Abnormality

20

0.2%

35

0.5%

40

1.5%

49

14%

* This table includes only chromosomal abnormalities that can be detected by standard chromosomal testing. Risks of having a baby with submicroscopic chromosomal abnormalities (which can be detected only by special testing) are not included.