Pregnancy calcium supplement according to their own situation, choose the right calcium tablets, such as calcium absorption is not good choose easily absorbed calcium lactate, calcium deficiency choose calcium carbonate with high calcium content, vitamin D deficiency choose calcium carbonate Vitamin D3 elemental tablets and so on. 1. Poor absorption: If the intestinal absorption function is not good, causing poor absorption of calcium, choose easily absorbed calcium tablets, such as calcium citrate and calcium lactate. 2. Calcium deficiency: choose calcium tablets with high calcium content, such as calcium carbonate with higher calcium content per unit weight, i.e. high calcium density. 3. Vitamin D deficiency: the synergistic nutrient of calcium is vitamin D, both of which play an important role in the process of bone metabolism, so vitamin D deficiency leads to calcium deficiency. Generally speaking, it is recommended that pregnant women choose calcium and vitamin D content are relatively high calcium tablets, such as calcium carbonate Vitamin D3 elemental tablets. Calcium supplementation in pregnancy needs to be examined in the hospital, assessed by the physician and choose the appropriate calcium tablets according to their own conditions, avoiding the arbitrary use of their own.