Calcium supplements for pregnant women should be taken under the guidance of a doctor, and calcium tablets should be taken from mid-pregnancy onwards, before that the body’s needs can be met through food intake. Calcium tablet selection and taking principle: Usually doctors will recommend pregnant women to start taking calcium supplements after 20 weeks of pregnancy, until 27-28 weeks of pregnancy, because with the rapid growth of the fetus, it is necessary to strengthen calcium supplementation. There are no special requirements for calcium supplements, you can choose the drugs with the national drug code and apply them according to the instructions, trying to contain vitamin D, vitamin K, etc. Be careful not to choose health care calcium supplements, the content of such calcium is generally low. In addition, pregnant women can take calcium from their daily diet. Milk and dairy products are good sources of calcium, which are rich in calcium and have a high absorption rate, and beans and soy products, seafood, meat and eggs can also provide rich calcium. If calcium supplementation is insufficient, fetal calcium deficiency is prone to congenital rickets or calcium deficiency convulsions, and calcium deficiency during pregnancy in pregnant women can induce calf twitching. However, calcium should not be supplemented blindly, but in reasonable and appropriate amounts. Usually do not drink caffeinated beverages, use fruit juice or plain water instead.