From the perspective of eugenics, 25-34 years old is the best time to get pregnant, and the risk of complications is lower. However, there is no uniform clinical standard for how long it takes to have a child after marriage, and it is necessary to start a pregnancy preparation plan after a comprehensive judgment of one’s marriage age, physical condition and economic conditions. The vast majority of newlyweds who have a normal sex life and do not take any contraceptive measures will get pregnant within about six months. If a newlywed couple has a childbirth plan, they need to make good pre-conception preparations.1. Physical preparation: both spouses need to develop good habits at least three months in advance, go to bed early, get up early, do not stay up late, ensure adequate rest and sleep; quit smoking and quit drinking. Pay attention to a balanced diet, eat more fresh vegetables and fruits, and supplement sufficient folic acid and calcium. At the same time, exposure to harmful stimuli should be prohibited and drugs should be applied as little as possible; 2. Spiritual preparation: both spouses should maintain a happy mood for conception, do not have a psychological burden, let nature take its course, and learn relevant pregnancy knowledge at the same time; 3. Pre-conception examination: both spouses should undergo basic examination before conception, such as both parties need to undergo eugenics four items, hereditary diseases, infectious diseases and other examinations. The male partner undergoes routine semen examination, and the female partner includes reproductive system examination and gynecological endocrine examination. Precautions As the risk of complications increases with age, it is recommended to weigh all factors and choose the most suitable time to prepare for pregnancy and not to take vaccinations during the preparation period.