A “highrisk” pregnancy means a woman has one or more things that raise her — or her baby’s — chances for health problems or preterm (early) delivery. A woman’s pregnancy might be considered high risk if she: … has high blood pressure, diabetes, depression, or another health problem.

There is no formal or universally accepted definition of a highrisk pregnancy. Generally, however, a highrisk pregnancy involves at least one of the following: The woman or baby is more likely to become ill or die than usual. Complications before or after delivery are more likely to occur than usual.
Too much standing on the job might increase the risk of the mother developing high blood pressure, as well as the risk of premature birth. That is why women in high-risk pregnancies, who work more than four hours a day on their feet, should switch to a desk job or quit by the 24th week.For instance, the risk of having a baby with a chromosomal defect increases with the mother’s age: A 33-year-old woman has a 1 in 208 chance that her baby will have a defect such as Down syndrome, according to the American College of Obstetricians and Gynecologists. Among women 10 years older, that number is 1 in 19.