After the third trimester of pregnancy, the significance of taking folic acid is not very big, folic acid tablets can be eaten or not eaten: 1, pregnant women to supplement folic acid, the main purpose is to prevent because of the lack of folic acid caused by fetal neural tube development malformation, fetal congenital heart disease, cleft lip, cleft palate, etc.. Generally, it is of greater clinical significance when taken in the first and second trimesters of pregnancy.2. After the third trimester of pregnancy, the physical development of the fetus has basically been finalized, and the taking of folic acid tablets is no longer of great significance in the prevention of fetal developmental malformations. However, appropriate supplementation of folic acid tablets can help prevent complications such as H-type hypertension or megaloblastic anemia in women during pregnancy.