Preparation for pregnancy requires abstinence from tobacco and alcohol for at least 3 months. Tobacco and alcohol are harmful to the body, not only affecting the quality of sperm and eggs, resulting in poorly fertilized eggs, but also having an adverse effect on the development of the embryo. Men and women should quit smoking and drinking for at least 3 months before starting to prepare for pregnancy. Women should pay attention to supplementing folic acid during the preparation period, and both men and women should take nutritional supplements, eat more fish, meat, eggs and other foods containing high-quality protein, and also eat more fresh vegetables and fruits. You should also do appropriate sports to enhance your physical fitness. Preparation for pregnancy must be away from tobacco and alcohol during pregnancy, not only will affect their own health, but also affect the development of the fetus. During pregnancy, you should also pay attention to regular maternity checkups, if there is any abnormality in time to seek medical attention.