Preparing to have a child requires tests including: first, male examination: sperm routine, liver function, urinary ultrasound, blood routine, electrocardiogram. Second, female examination: reproductive system examination, blood routine, urine routine, rubella, toxoplasmosis, cytomegalovirus three, liver function, oral examination, gynecological endocrine examination. If one of the spouses has a family history of genetic disease, the couple also needs to check for chromosomal abnormalities. Preparation time for pregnancy is usually 3 months, starting 3 months before conception women can take folic acid tablets 0.4mg per day, avoid staying up late at night, and insist on exercising for half an hour every day. Men need to quit smoking and drinking, and avoid irregular work and rest. During the preparation for pregnancy, abstain from sex.