1. The significance of the weight gain standard for pregnant women. The weight gain standard for pregnant women refers to the range and speed at which a pregnant woman\’s weight should increase during pregnancy. The formulation of this standard is very important to protect the health of mothers and infants. Because if a pregnant woman does not gain enough weight or gains too much weight, it will cause harm to the fetus and mother. Therefore, it is very necessary for every expectant mother to understand the standards for maternal weight gain. 2. Distribution of weight gain during pregnancy During pregnancy, maternal weight gain is not evenly distributed. According to research, about one-third of weight gain comes from the fetus