Risks of Pregnancy Over Age 30
Many women wait until later in life to have children. In the U.S., birth rates for
women in their 30s are at the highest levels in 4 decades. But an older mother may
be at increased risk for things such as:
High blood pressure
Some studies show that while there is a higher risk of pregnancy problems in older
women, their babies may not have more problems than babies of younger women. This
is more likely when women get prenatal care and give birth in a healthcare facility
ready to care for high-risk mothers and babies.
Risk for chromosome problems
The risk for chromosome problems increases with the mother's age. The chance of having
a child with Down syndrome increases over time. The risk is about 1 in 1,250 for a
woman who conceives at age 25. It increases to about 1 in 100 for a woman who conceives
at age 40. The risks may be higher. This is because many statistics only report live
births. They don't note pregnancies with chromosome problems that ended due to pregnancy
After having 1 child with Down syndrome, the chance of having another baby with Down
syndrome is higher. After age 40, the recurrence risk for Down syndrome is based on
the age of the mother at delivery. Most babies with Down syndrome are born to women
younger than 35. This is because women under age 35 have more babies than women over
Risk for miscarriage
Some studies have shown a higher chance of miscarriage (early pregnancy loss) in older
mothers. For all women, about half of first trimester miscarriages happen because
of a chromosome problem in the baby. The risk of chromosome problems increase with
the mother’s age. So miscarriage is also more likely.
Working with your healthcare provider
If you're pregnant and over age 30, talk with your healthcare provider about your
health. Discuss plans for helping you and your baby have a healthy pregnancy.
Your healthcare provider may refer you to a genetic specialist or genetic counselor.
They can explain the results of chromosome tests in detail. This includes what the
risks may be in another pregnancy and what tests can diagnose chromosome problems
before a baby is born.
Prenatal testing can help diagnose or rule out chromosome problems and other genetic
birth defects. Testing may include:
Ultrasound. This imaging test uses sound waves to look at organs and other tissues in the baby.
Chorionic villus sampling (CVS). This test is done on a sample of the tissues around the baby.
Amniocentesis. This is a test done on a sample of the amniotic fluid.
Cell-free fetal DNA. This test checks the mother's blood for chromosome problems.