Is it necessary to take calcium supplements during pregnancy, when to start and how much is appropriate? This question has troubled many pregnant women, and we have clinically encountered pregnant women who did not take calcium supplements throughout pregnancy, as well as pregnant women who had calcium deficiency to the point of muscle cramps in the lower limbs, and pregnant women who took too much calcium and had premature calcification of the fetal skull. The following is a discussion of how to take calcium supplements appropriately during pregnancy. Calcium is an essential mineral for the human body and a raw material for fetal bone building. After mid-pregnancy, especially from the fifth month (16 weeks) onwards, fetal teeth begin to calcify, permanent tooth germ begins to occur, and a large amount of calcium is needed to build bones. Therefore, pregnant mothers have a high demand for calcium. Non-pregnant women need about 800mg of calcium per day, while mid-pregnancy women need about 1000mg of calcium per day and late pregnancy women need about 1500mg of calcium per day, which shows that if pregnant women cannot take extra calcium, it will affect the growth and development of the fetus. Therefore, it is very necessary to take calcium supplements during pregnancy. Dietary supplementation is a most reliable and effective way of calcium supplementation. It is important for pregnant mothers to drink 250ml of milk, formula or yogurt every day, and pay attention to the intake of calcium-rich foods, such as white tofu (about 100g), eggs (1-2), boiled shrimp (5 tbsp), sea fish and appropriate amount of kelp, so that the calcium intake can reach 800mg as much as possible. The dietary survey of pregnant mothers in China shows that the daily calcium intake per capita is only about 479mg, such as a daily box of fresh milk, which is only 700mg, so Chinese mothers should also take additional calcium every day, and taking calcium supplements is an effective way. So take calcium supplements daily after 16 weeks of pregnancy, especially for pregnant mothers with symptoms of calcium deficiency, and should take calcium supplements until the time of weaning after delivery. If breastfeeding exclusively, about 1200mg of calcium supplementation is needed daily during breastfeeding.