Iron supplementation is generally recommended right after pregnancy and calcium supplementation after 20 weeks (April and May). Folic acid and trace elements are supplemented before pregnancy and for 3 months after pregnancy. Some pregnant women are afraid that calcium supplementation in late pregnancy will cause craniosclerosis of the fetus and lead to difficult delivery. Calcium supplements include: chewable calcium (Naloxa), Calcium D, etc., which are more abundant in milk, bones and other foods. Iron supplements are usually taken after meals, as many iron supplements can cause digestive discomfort when taken. Many pregnant women have low levels of the raw material for hematopoiesis (serum iron), although their hemoglobin tests are normal and they do not appear to be anemic. (Similar to the fact that you have quite a lot of pocket money around, but you don’t have much money stored inside the bank). Therefore this type of pregnant women should also take iron supplements. Personally, I think you can supplement until you are breastfeeding. Iron supplementation is available in the form of blood generators, Lipitor, etc. Iron is more abundant in foods such as animal liver and egg yolk.