Folic acid is taken orally at 0.4 mg once a day to prevent fetal neural tube abnormalities at this time. It should be taken orally for the first 3 months of pregnancy and can be stopped after 3 months of pregnancy if taken orally. There are also some women who have a metabolic disorder of folic acid and can have a quantitative folic acid test after pregnancy. If abnormalities are detected, the dose of oral folic acid should be increased at this time and should not be stopped until delivery. To achieve eugenics, relevant tests should be performed. When taking folic acid orally, avoid taking it too many times or in too large a dose, there will be constipation and it may even affect the function of the gastrointestinal tract, affecting nausea and vomiting. Therefore, it is important to follow the results of the examination and take it orally in a symptomatic manner.