Folic acid can be taken until birth, normally in the first 3 months of pregnancy, but now it has been proven through a large number of sources that it can be taken throughout pregnancy and can significantly improve the incidence of fetal neural tube abnormalities. The original saying is to start taking it in the first 3 months of pregnancy and continue to take it until 3 months after pregnancy, but now this saying has changed and it is more beneficial to take it during the whole pregnancy. Pregnant women with folic acid metabolism disorder can take 0.8mg and continue to take it until delivery, while normal pregnant women can take 0.4mg because folic acid can effectively prevent the development of fetal neural tube malformation.