How much weight gain is appropriate in the middle of pregnancy should be decided according to the pre-pregnancy weight classification. 1.If the pregnant woman is of low weight before pregnancy, the normal weight gain in the middle of pregnancy should be about 8kg; 2.If the pregnant woman is of normal weight before pregnancy, the normal weight gain in the middle of pregnancy should be about 6kg; 3.If the pregnant woman is of overweight before pregnancy, the normal weight gain in the middle of pregnancy should be about 4kg; 4.If the pregnant woman is obese before pregnancy, the normal weight gain in the middle of pregnancy should be about 3kg. If the pregnant woman was obese before pregnancy, her normal weight should increase by about 3kg in the middle of pregnancy. Maternal weight gain can affect the near and long-term health of the mother and child. Excessive maternal weight gain increases the risk of hyperemesis, gestational diabetes and obstructed labor; insufficient maternal weight gain will increase the risk of fetal growth restriction, preterm birth, low birth weight babies and other adverse pregnancy outcomes. Therefore, it is important to pay attention to maternal weight management. In case of excessive weight gain, control the diet, control the total daily calorie intake, reduce the intake of fat and sugar, and do not eat too much fruit and pasta. Eat small and frequent meals, 5-6 meals a day, including 3 regular meals, 2 extra meals and 1 night snack, to reduce blood sugar spikes. Maintain proper activity level and burn energy. When weight gain is too little or not, you need to strengthen nutrition in time. In addition to ensuring three regular meals a day, you should also diversify your diet every day, including fruits, vegetables, soy products, meat, etc. You should not be partial. In addition, you can ensure 2 cups of milk powder for pregnant women every day to supplement the nutrients not absorbed in the diet, so that the nutrition during pregnancy is more comprehensive and balanced.