Since the opening of the second child policy, more senior women have been thinking about having a second child, even some women over the age of 50. The ability to have a second child depends on the ability to ovulate. Most women go through menopause between the ages of 45-55, and even if they do not go through menopause, the function of the ovaries has declined at this time, and the eggs are thinning and the quality of the eggs is declining, making it easy to have a miscarriage after pregnancy, and the incidence of fetal malformations increases accordingly, such as trisomy 21, the incidence of which increases geometrically with the age of the pregnant woman. In addition, other organs of the female body, such as the heart and kidneys, are also in a declining stage, and generally cannot afford the whole process of pregnancy, which can easily lead to complications of various organs and endanger the health of women.