Having a healthy baby is the desire of every parent-to-be. As the economy improves, more and more attention is being paid to nutrition during pregnancy, and many people deliberately supplement with extra nutrients after pregnancy. But this is a misconception. The more you eat during pregnancy, the healthier your baby will be. Because of this, gestational diabetes and huge babies are increasing year by year in the city. Weight gain during pregnancy is directly related to the nutrition during pregnancy. Excess nutrition and excessive weight gain increase the chances of diabetes, and the fetus is prone to obstructed labor and injury during delivery because of its excess weight; while insufficient nutrition during pregnancy, the fetus shows low birth weight, and these children have more health problems. So 9 months of pregnancy, how much weight gain is more appropriate? In fact, there is no standard answer to this question. The amount of weight to be gained according to BMI needs to be treated differently for different body types. In general, thin people can gain more weight, while fat people need to control their weight gain more strictly. The distinction between fat and thin is medically expressed by the body mass index (BMI), which is the weight divided by the square of the height, and the height in meters, the normal value of BMI. So to understand how much weight you need to gain during pregnancy, the first thing is to know your pre-pregnancy BMI. For those with a very thin body type (BMI less than 18), a weight gain of 20kg throughout pregnancy is appropriate. For those with a thin body type (BMI of 18 to 20), a weight gain of 13 to 17 kg throughout pregnancy is appropriate. For a normal body type (BMI 20-23), a weight gain of 12kg throughout pregnancy is normal. For obese body type (BMI greater than 23), weight gain of 8 to 11 kg throughout pregnancy can be used for some internal energy storage. In case of twin or multiple pregnancies, the doctor should be consulted, as weight gain is related to the number of fetuses. Weight gain should be slow and steady, and it is not uniform during pregnancy. For normal weight people, a weight gain of 1 to 2 kg is appropriate during the first 3 months of pregnancy. Early in pregnancy, appetite may be affected due to pregnancy reactions, but it is important to ensure nutrition during this period for fetal development. Danish studies have found that poor nutrition in the early stages of pregnancy is associated with a greater risk of diabetes and hypertension in the later years of life. Therefore, if the early pregnancy reaction is heavy and affects eating, it is advisable to eat less and eat more, vomit and eat more food that is beneficial to the child’s brain development. Protein, inorganic salts, vitamins and sugar are all essential ingredients for the development of the fetal brain, so pregnant women should diversify their food and should not abstain from eating too much. Many pregnant women after the pregnancy reaction stage, appetite improved and began to eat a lot to make up for the shortage of the first, which is also wrong. The fetus has its own growth and development rules, and excess nutrition will only be absorbed by the mother and cause obesity. The best way to gain weight is to gain it slowly but steadily. In the middle and late stages of pregnancy, it is appropriate for a normal-sized person to keep the weight gain to about 0.5kg per week. Too slow weight gain indicates that the fetus is lagging behind in growth; too slow or stagnant weight gain may indicate the existence of a fetal growth lag, making it easy to deliver low-weight children, who are prone to many diseases. Excessive or rapid weight gain during pregnancy is not a good thing for the mother or the fetus. Excessive weight gain may indicate the presence of gestational diabetes. For the mother, too much weight gain can predispose her to obesity and diabetes after delivery. Excessive fetal weight gain also predisposes to the delivery of a large fetus (birth weight greater than 4 kg). Huge babies are not easy to pass through the birth canal during delivery, which increases the chance of cesarean section, or difficult delivery and birth injury during delivery, and also prone to neonatal hypoglycemia after delivery. Therefore, it is not better to eat as much as you can during pregnancy, and you can consult a nutritionist to adjust your diet during pregnancy if necessary.