What does folic acid do during pregnancy?

Fewer birth defects: Folic acid has been shown to lower the risk of neural tube defects like spina bifida in babies. Since the nervous system develops early on, it's important to take Folic Acid as early as possible in your pregnancy. Ideally, women who want to or could get pregnant should take Folic Acid before they conceive.

Prevent spine defect: Folic acid, AKA folate (folic acid) (vit B9), is recommended for all women wanting to get pregnant -- 0.4mg (400mcg) daily, which is important for preventing birth defects like spina bifida. Women w/ a hx these disorders should take 10x that amt daily -- 4mg (4000mcg) through the 3rd month of pregnancy. It won't affect fertility, chances of conception/twins, or periods. Can help with anemia.