I. What preparations should be made before pregnancy? 1, the couple to ensure good health: including physical and mental health, a healthy couple to give birth to a healthy child, especially the mother’s health is more important (pregnancy up to 9 months, the fetus in the uterus during this period of growth and development) 2, the couple to try to quit bad habits: the man should reduce the amount of alcohol and tobacco, the woman try to quit smoking and alcohol. The couple should try to reduce the amount of smoking and alcohol, and the woman should try to quit smoking and alcohol. Develop good work and rest habits, reduce night life, and go to bed early and get up early. 3.The necessary physical examination and purpose before pregnancy: mainly for the female partner: BP measurement, ECG, liver and kidney function, blood and urine routine, five items of hepatitis B, hepatitis C, gynecological ultrasound. Gynecological examination: external genitalia and internal genitalia examination to exclude developmental malformations, inflammation and tumors, etc. Purpose: (1) Prohibition of childbirth for those who cannot tolerate pregnancy and delivery. (2) Some diseases need to be treated before conception: inflammation of the reproductive system, some benign tumors, hyperthyroidism, diabetes mellitus, etc. (3) Although able to have children, but suffering from diseases, strengthen prenatal examination during pregnancy. The general principle: 1. The nutrition required during pregnancy must be more than that during non-pregnancy. 2, poor nutrition during pregnancy → affect fetal growth and intellectual development → fetal growth restriction and low weight babies, and even miscarriage, premature birth, fetal malformation and fetal death in utero. 3.The diet during pregnancy should be high in calories, rich in protein, fat, sugar, trace elements and vitamins, but avoid excess nutrition → cause huge children and poisoning caused by excess trace elements. Diet should be rich and diverse. For example: meat, milk, eggs, cheese, vegetables, fruits. Trace elements: iron-hemoglobin during pregnancy.