Folic Acid
Folic acid is a B vitamin. If a woman has enough folic acid in her body before and during pregnancy, it can help prevent major birth defects of the baby's brain and spine. Women need 400 micrograms (mcg) of folic acid every day.
Good sources include
broccoli
brussels sprouts
leafy green vegetables, such as cabbage, kale, spring greens and spinach
peas
chickpeas and kidney beans
liver
fortified breakfast cereals