The optimal time for a woman to have children should be between the ages of 25-29. This is because a woman’s fertility depends on the number of eggs in her ovaries and the quality of her eggs. There is a set number of eggs that a woman will ovulate in her lifetime, usually 400-500. As the number of eggs decreases with age, the optimal age for fertility is between the ages of 25-29. As ovarian function decreases with age, the infertility rate is 33% after age 35 and 50% after age 40, so the best age for women to have children should be between 25-29 years old. Many women believe that nowadays there are assisted reproductive capabilities such as IVF and artificial insemination, so they can have a baby whenever they want, but this philosophy is wrong. Because whatever the technology depends on the woman’s eggs, the older she is, the poorer the quality of her eggs, the lower the number of follicles, and the less chance of conception. Even if conception does occur, the miscarriage rate is higher, so women should not miss the best time to affect their fertility.