For pregnant women without high-risk factors who did not take folic acid before pregnancy do not need to take additional doses after pregnancy, you need to take under the guidance of a doctor. Preventive folic acid supplementation can effectively prevent the risk of neural tube malformation in the fetus, so it is recommended to take folic acid supplementation in the first 3 months before pregnancy and the first 3 months after pregnancy as prescribed by the doctor. However, women with a history of neural tube malformation pregnancy, diabetes and other high-risk factors need to increase the dose of folic acid under the guidance of a physician. So no high-risk factors who did not take folic acid before pregnancy, after pregnancy is no need to increase the dose, follow the doctor’s instructions to take on the line. It takes 4 weeks for a woman to correct a folic acid deficiency after taking folic acid, so it is important to start taking folic acid at least 1 month before pregnancy in order to achieve the desired effect, and it can be taken under the guidance of a doctor for the entire period of pregnancy and postpartum. Nausea, bloating and other gastrointestinal reactions may occur after taking folic acid, so it is necessary to take it under the supervision of a doctor.