From the medical point of view, when women reach 18 years old, their sexual organs are basically developed, but the maturity of the sexual organs does not mean that the functions of all the organs of the body have been sound, the skeletal system and the higher nervous system are generally mature until the age of 25. If the mother has to bear the task of supplying nutrition to the fetus and continue to complete her own development, it will definitely affect the health of mother and child and increase the chance of difficult deliveries and even cause some complications and sequelae. In addition, psychological maturity is also a necessary condition for a normal pregnancy, and the maturity and stability of women’s psychological state is generally later than the maturity of physical development. From the general physiological state of the human body, the best age for women to give birth is 25 to 29 years old, when the body reaches its prime, various physiological functions reach the best state, and psychological maturity, at this time pregnancy can give the fetus the best internal environment for survival, which is conducive to the healthy development of the fetus. The Yellow Emperor’s Classic of Internal Medicine has “three seven, the average kidney energy, so the real teeth and long pole; four seven, tendons and bones firm, hair long pole, the body is strong”, from the point of view of fertility, this is the best time to conceive and give birth. When a woman is over 30 years old, her health starts to go downhill, which will have an impact on the quality of her eggs.