Level 1: Why do pregnant women need to supplement calcium? Pregnancy is a critical period for fetal growth and development. The fetus needs a large amount of calcium to build bones and teeth. If there is a lack of calcium in a pregnant woman\’s body, the fetus will get it from the mother\’s body, causing symptoms such as fatigue, dizziness, and cramps in the hands and feet of the pregnant woman. In addition, calcium deficiency during pregnancy can increase the risk of complications such as high blood pressure and preeclampsia in pregnant women. Level 2: What kind of calcium supplement should be taken during early pregnancy? Early pregnancy is a critical period for the formation and development of embryonic organs. At this time, calcium tablets containing inorganic salts of calcium should be selected. Inorganic calcium salts are easily absorbed and utilized