Make sure to eat your fair share of salads. "Folic acid is a B vitamin that is vitally necessary for pregnant women," Mark P. Trolice, M.D., reproductive endocrinology and infertility specialist at Fertility CARE - The IVF Center and Associate Professor of Ob/Gyn at the UCF College of Medicine, tells POPSUGAR. "Before pregnancy and during pregnancy, a woman needs a minimum of 400 micrograms of folic acid daily to help prevent major birth defects of the fetal brain and spine called neural tube defects. Folic acid should be started several months prior to attempts at conception." Great sources include beans, peas, spinach, and legumes.