What are the risks of getting pregnant or having a baby at a specific maternal age?

Depends: As maternal age increases, the risk of down's syndrome and other chromosomal problems increases. At age 18, the risk is 1/20, 000, at age 28 it is 1/2000, at age 38 it is 1/200, at age 48 it is 1/10. The other risks that can increase with maternal age are blood pressure problems, diabetes of pregnancy, etc.

Some fixed/some vary: Some pregnancy risks are specific to a couples family tree.All pregnancies have ~ 4% risk of an unexpected outcome, from clefts to prematurity & others. The risk of a chromosome is lowest in the early 20's (~1/1700) & rises to 1/100 @ 40 & 1/50 >45. I encourage those with the question to seek out a geneticist @ a children's hospital or medical school for the a review of personal risk.