The first 4 weeks of pregnancy is an important period for fetal neural tube differentiation and formation, and folic acid deficiency during this period may increase the risk of fetal neural tube malformation and premature birth. Women of childbearing age should consume as much folic acid-rich food as possible from the beginning of pregnancy planning and take 400μg of folic acid supplement daily from 3 months before pregnancy and continue throughout pregnancy. 2, often eat iron-rich food pre-pregnancy iron deficiency is likely to lead to premature birth, maternal weight gain during pregnancy and low birth weight of the newborn, so women should reserve enough iron before pregnancy for use during pregnancy. It is recommended that women in the pre-pregnancy period should consume iron-rich foods, and women of childbearing age with iron deficiency or anemia can consume iron-fortified foods in appropriate amounts or take small doses of iron supplements under the guidance of a doctor. 3. Ensure the intake of iodized salt and increase the intake of seafood appropriately. Iodine deficiency during the peri-pregnancy period and early pregnancy can increase the risk of cretinism in the newborn. Since iodized salt is consumed before and during early pregnancy, it is also recommended to consume iodine-rich seafood at least once a week. 4. Stop smoking and drinking alcohol Frequent smoking or drinking by one or both spouses not only affects the development of sperm or eggs, causing malformation of sperm or eggs, but also affects the smooth implantation of fertilized eggs in the uterus and embryonic development, leading to miscarriage. Alcohol can enter the blood of the fetus through the placenta, causing intrauterine stunting, abnormal development of the central nervous system and mental retardation. 1.Light and palatable meals Light and palatable meals are good for reducing pregnancy reactions in early pregnancy, so that pregnant women can take in as much food as possible to meet their nutritional needs. 2.Less food and more meals Pregnant women with heavy reactions in early pregnancy do not need to emphasize the regularity of diet as normal people do, but should make timely adjustments according to the appetite of pregnant women and the severity of their reactions, and take the approach of less food and more meals to ensure the amount of food eaten. 3, ensure the intake of sufficient amount of carbohydrate-rich food Early pregnancy should try to consume more carbohydrate-rich cereals or fruits, to ensure the daily intake of at least 150g of carbohydrates (about 200g of cereals). 4, more intake of folic acid-rich foods and folic acid supplementation Folic acid deficiency in early pregnancy can increase the risk of neural tube abnormalities and premature birth of the fetus. Women should consume more folic acid-rich foods as early as possible from the beginning of the planned pregnancy. After conception, women should continue to take 400μg of folic acid daily until the whole pregnancy. 5. Quit smoking and alcohol Pregnant women who smoke or frequent passive smoking may lead to fetal hypoxia and malnutrition and developmental delays. When pregnant women drink alcohol, alcohol can enter the blood of the fetus through the placenta, causing intrauterine stunting, abnormal development of the central nervous system and mental retardation, which is called alcoholism syndrome. Third, the dietary guidelines for women in the middle and end of pregnancy 1, appropriate to increase the intake of fish, poultry, eggs, lean meat, seafood Fish, poultry, eggs, lean meat is a good source of high-quality protein, which can also provide n-3 polyunsaturated fatty acids, eggs, especially egg yolk is a good source of lecithin, vitamin A and vitamin B2. 2, appropriate to increase the intake of milk Milk or dairy products are rich in protein, which is important for the supplementation of protein during pregnancy, and is also a good source of calcium. 3, often eat iron-rich food From the middle of pregnancy, the pregnant woman’s blood volume and hemoglobin increase, while the fetus needs iron reserves, it is appropriate to increase the intake of iron from the middle of pregnancy, if necessary, under the guidance of doctors to supplement small doses of iron. 4, moderate physical activity, maintain the appropriate weight growth Pregnant women should monitor their weight at the appropriate time, and according to the rate of weight gain appropriate adjustment of food intake. They should also do not less than 30 minutes of low-intensity physical activity every day according to their own physical ability, preferably 1 hour to 2 hours of outdoor activities, such as walking, gymnastics, etc. 5, no smoking and alcohol, eat less stimulating food Tobacco and alcohol have obvious toxic effects on all stages of embryonic development, such as easy to cause premature birth, miscarriage, fetal malformation, etc.. Women who have the habit of smoking and drinking alcohol must abstain from smoking and alcohol during pregnancy and stay away from the smoking environment.