There is no best time for pregnant women to take calcium tablets, which are usually started in the middle of pregnancy, between 13 and 19 weeks. After pregnancy, the fetus in the uterus continues to develop, pregnant women need to consume a large amount of calcium, calcium supplemented through food is insufficient, so in order to maintain the normal development of the fetus, it is recommended that pregnant women start taking calcium supplements from mid-pregnancy. Calcium supplementation for pregnant women is usually better to take half an hour after meals, which will increase the efficiency of calcium absorption. Calcium supplementation for pregnant women can help the growth and development of the fetus, can maintain the normal function of the neuromuscular, but also can prevent pregnant women with calcium deficiency symptoms of leg cramps or leg pain. It is recommended that pregnant women should keep an optimistic mindset and eat more food with high protein content, such as shrimp, fish or eggs, so as to replenish the nutrients in the body. During pregnancy, it is necessary to go to the hospital regularly for maternity checkups to prevent the fetus from developing adverse conditions.