It is necessary for pregnant women to take calcium tablets. As pregnancy approaches, the body of pregnant women begins to undergo many changes, including osteoporosis during pregnancy. In order to maintain the growth needs of mother and fetus, pregnant women need to supplement more calcium. However, it is sometimes not easy for pregnant women to absorb sufficient calcium through food, so they need to rely on calcium supplements. In addition, pregnant women also need to pay attention to supplementing vitamin D, zinc and other nutrients to promote calcium absorption. When taking appropriate calcium supplements