Maternal age connected to Down syndrome

Your age has a big influence on your likelihood of giving birth to a child with Down syndrome.

Statistics suggest that if you’re under 25, your risk of having a baby with Down syndrome is one in 1,500. By the age of 30, your risk is one in 910, which is still very low. However, when you reach 35, your risk jumps up to one in 385 and by the age of 40 your risk is one in 110. At 45, it increases dramatically to one in 30. But while Down syndrome is far more likely as you become older, in reality more Down babies are born to women under 35 simply because more of them have babies.

Your age is taken into account when you’re screened for Down syndrome, and if you’re an older woman you are more likely to screen positive. Keep in mind that only a diagnostic test, such as a CVS or amniocentisis can diagnose abnormalities. See over 35 and trying for a baby for more information.

The information in this feature is intended for educational purposes only. If you have any concerns about your health, the health of your child or the health of someone you know, please consult with a doctor or other healthcare professional.