Women need about three months to prepare for pregnancy, which is more appropriate for the following reasons: First, women need to go through a long development of eggs before ovulation, a healthy and high-quality egg takes about 85 days, through layers of selection, and finally select the superior eggs to be discharged, so women need three months to prepare for pregnancy for all-round conditioning. Secondly, women and men need to avoid smoking and alcohol during pregnancy preparation. The body cell metabolism cycle is three months, during which toxic substances and other undesirable factors can be discharged from the body in order to develop better eggs and sperm combination. Thirdly, it takes about 72-90 days for a man’s sperm to actually develop healthy sperm, so men need to prepare for pregnancy three months in advance. In addition, women need to go to the hospital for routine gynecological checkups and men need to check if their sperm is normal before preparing for pregnancy.