I. Early pregnancy (within 13 weeks of gestation) This is the period of embryonic differentiation and organ formation, which is very sensitive to external teratogenic factors, so it is necessary to balance various nutrients and not to cause fetal malformation due to lack of or too much nutrients. The recommended daily energy is >1800Kcal, 150-200g of staple food, 50-100g of beans and bean products (soy milk, tofu), 200-250g of milk or yogurt, 50-100g of fruits, 25-50g of eggs, 100-150g of meat, poultry and fish, 20g of fats and oils, and some dried fruits (melon seeds, peanuts, walnuts, etc.) as snacks. Second, the middle of pregnancy (13 to 27 weeks of gestation) This is a period of accelerated fetal growth and development, the mother’s caloric and nutrient intake is very important, but should not be gluttonous, overeating, to be pregnant weight growth in a reasonable range. Daily energy>2100～2300Kcal, 300～400g of cereals, 100～150g of beans and soy products (soy milk, tofu), 250g of milk or yogurt, 400～500g of vegetables, 100～200g of fruits, 150～200g of meat, poultry and fish, 25g of fats and oils, more green vegetables, shrimp skin, seaweed, kelp and other micronutrients. Third, the late pregnancy (28 weeks of gestation to before delivery) nutrition and calorie supplementation as in the middle of pregnancy. During this period, the fetus grows fast and reaches the maximum acceleration period, the nutrition of pregnant women should be balanced and the weight gain should be 0.4~0.5 kg/week, and sweet and fried food should not be eaten. The delivery period is 8 to 10 hours long and physically demanding. Pregnant women who do not drink water or eat can become dehydrated and acidotic, which can affect the safety of the fetus. Food should be nutritious, easy to digest, light, semi-fluid or fluid, such as milk, noodles, wontons, chicken soup, which can supplement both nutrition and fluid. V. Lactation Daily energy > 2600-2800Kcal. 85-90g/day protein, carbohydrates must account for 62.7-68.3% of the total calories, in addition to more vitamins and minerals, so breastfeeding maternal diet should be rich in various nutrients, especially high-quality protein, the proportion of fat should not be too much, vegetables and fruits to eat more, food should be light, nutritious, easy to digest. Drink more soup to increase the milk, should not eat spicy food. If you have a poor appetite and eat less, you can add a variety of vitamins and minerals to the nutritional medicine.