If a pregnant woman can fully meet her calcium needs with her daily intake, not taking calcium tablets all the time after pregnancy will not necessarily have an adverse effect on the fetus. However, if the calcium requirement is not met by her diet, the fetus may be affected and its growth may be delayed. As pregnancy progresses, there are differences in the calcium concentration and diet of pregnant women.1. Early Pregnancy: If pregnant women often eat calcium-rich foods or are not calcium deficient, not taking calcium tablets will not have much effect on the fetus. If you do not take calcium supplements in time, the fetus will grow and develop slowly, and the pregnant woman may have leg cramps during pregnancy. 2. mid and late pregnancy: the fetus’ bones grow and develop rapidly during this period, and the demand for calcium is large. If you do not take calcium supplements, it is likely that your body is already in a state of calcium deficiency, which can cause adverse effects such as fetal growth retardation and poor bone development. Therefore, it is recommended to strengthen the intake of calcium in the diet during the middle and late pregnancy and consume more calcium-rich foods such as peanuts, soybeans, walnuts, shrimp, dairy products, etc. However, the content of calcium in food is limited, and calcium is easily lost after cooking, so calcium supplementation by food alone is often insufficient. Calcium supplements should be taken under medical supervision.