Usually, pregnant women need calcium supplements when they are pregnant in order to meet their own needs and those of the developing fetus. The growth and development of the fetus, especially the development of skeletal tissue, requires nutrients from the mother’s body. In addition, in addition to supplying calcium for fetal development, pregnant women need to meet their own metabolic needs for calcium to maintain healthy bones. Therefore, pregnant women need to take calcium supplements during pregnancy. I. Stages of calcium supplementation during pregnancy After pregnancy, it is necessary to carry out according to the needs of pregnancy: 1. early pregnancy (1-3 months): the fetus has not yet formed in early pregnancy, there is no calcium demand for the mother, the calcium contained in food can basically ensure the normal operation of the body functions of pregnant women, so there is no need for additional calcium supplementation; 2. mid-pregnancy (4-6 months): mid-pregnancy is a period of vigorous fetal development, requiring a large amount of calcium. Pregnant women can eat more calcium-containing foods or take calcium products as needed. At the same time, you should get more sunlight to promote the absorption of calcium in your body; 3. Late pregnancy (7-9 months): In order to ensure the smooth delivery and normal development of the fetus, pregnant women also need to insist on calcium supplementation. Pregnant women can take calcium through a variety of ways, and the common ways of calcium supplementation are as follows: 1, food intake: such as milk, beans and soy products, meat, eggs and seafood, vegetables, nuts, etc.; 2, pharmaceuticals: if dietary supplements can not meet the calcium needs, we should take calcium supplements under the guidance of a doctor. Third, pregnancy calcium supplementation should pay attention to the following aspects: 1, pay attention to the time of calcium supplementation: half an hour after meals, before bedtime, in the morning; 2, maintain an appropriate amount of outdoor activities: outdoor activities can synthesize enough vitamin D to promote the absorption of calcium; 3, reduce the intake of oxalic acid, phytic acid: such as spinach, amaranth, sweet potatoes, rice, flour, etc.; 4, reduce the intake of phosphoric acid, fatty acids, high fat. Such as carbonated beverages, burgers, French fries, etc.; 5. Do not over-supplement calcium: follow the doctor’s prescription for calcium supplementation to avoid overdose leading to placental aging, amniotic fluid reduction, etc.