If a pregnant woman does not take calcium tablets after pregnancy, it will have an impact on both the fetus and the pregnant mother. It is recommended that women who are pregnant start taking calcium supplements from the middle of pregnancy, because the growth and development of the fetus requires a large amount of calcium and other trace elements, and a full-term fetus will store about 30g of calcium in its bones, 80% of which is accumulated during the last three months of pregnancy, so it is recommended to strengthen the diet in the middle and late pregnancy Therefore, it is recommended to increase the intake of calcium in the diet and to take calcium supplements during the middle and end of pregnancy. However, since the amount of calcium in food is limited and it is easily lost after cooking, it is not enough to rely solely on food to supplement calcium, which may lead to fetal growth restriction and maternal osteoporosis, so it is necessary to take oral calcium supplements along with diet during pregnancy.