It is usually best for pregnant women to start taking calcium supplements from mid-pregnancy, around 14-19 weeks of pregnancy, but the exact timing should depend on the calcium deficiency of the pregnant woman. And the best time of the day to take calcium supplements is before going to bed or between meals. During pregnancy, women need to take more calcium supplements because the calcium needed for fetal bone development comes from the mother’s body. Pregnant women can first get calcium from their daily diet, such as milk, yogurt, soybeans, tofu, shrimp skin, carp, etc. From the middle of pregnancy, the fetus grows faster and the amount of calcium needed by the pregnant woman increases significantly. If the amount of calcium supplemented by food cannot meet the demand, the pregnant woman can take calcium tablets according to the professional doctor’s advice. In addition, pregnant women need to pay attention to the calcium supplementation is not the more the better, calcium supplementation should be done in small amounts and several times, the effect will be better.