An advanced maternal age, or advanced maternal age, is defined as a pregnant woman whose expected age of delivery is 35 years old or older. The risk of gestational hypertension, pre-eclampsia, gestational diabetes and other diseases is significantly increased in advanced maternal age, and the risk of chromosomal abnormalities or malformations in the fetus is higher in advanced maternal age compared to the optimal childbearing age. Under normal circumstances, it is recommended that women give birth at the optimal childbearing age, when the reproductive system of the female body has matured, and the female energy and physical strength are strong, and the chances of high blood pressure, high cholesterol or high blood sugar during pregnancy are relatively small. At the same time, the quality of eggs at this age is higher, and the chances of miscarriage or chromosomal abnormalities are lower. Therefore, women over the age of 35 should undergo a detailed examination before getting pregnant, and all the indicators are normal before they can carry out normal preparation for pregnancy and delivery. During pregnancy, they should also undergo regular obstetric examinations to rule out chromosomal abnormalities in the fetus and to ensure the safety of the mother and fetus.