Even if you are already pregnant, you need to continue to take folic acid tablets orally because folic acid itself is to prevent fetal neural tube abnormalities and is taken before pregnancy, mainly to supplement the amount of folic acid, and to continue taking it after pregnancy, which clinically reduces the birth of anencephalic children and children with spina bifida, so that the purpose of eugenics and eugenics can be achieved. Therefore, it is recommended to take folic acid tablets even if you are already pregnant, and it is recommended to stop taking them until the third trimester of pregnancy. In clinical practice, deficiency of folic acid can lead to neural tube malformation, and exposure to toxic and harmful gases or objects may also lead to fetal malformation. And be sure to do regular maternity checks during pregnancy.