Having a second child at age 37 is considered advanced maternal age. If you are 35 years old or older during the pregnancy, you are in advanced maternal age. If you are pregnant for the first time, it is called advanced primigravida; if you have lived with a child before, it is called advanced menstrual age. Advanced age is a risky background factor during pregnancy and prenatal diagnosis is first recommended for women who are pregnant at or older than 35 years old. Prenatal diagnosis includes taking chorionic hair, amniotic fluid or umbilical cord blood to check the chromosomes of the fetus to see if the baby has any chromosomal abnormalities. Because of the increased chance of having a fetus with chromosomal abnormalities in women of advanced age, during pregnancy it is directly recommended for pregnant women to have an interventional prenatal diagnosis rather than a non-invasive one. Advanced maternal age also increases the risk of obstetric complications during pregnancy, such as gestational hypertension, gestational diabetes, gestational heart disease, etc. The risk of these diseases is also higher than the risk of occurring in lower age pregnancies.