Folic acid: 600 mcg. Folic acid helps form the neural tube, which is what forms the baby's brain and spine.
Vitamin A: 750 to 770 mcg "Vitamin A plays a role in the formation of the fetal eyes, ears, limbs and heart," says Dr. Purdie.
Vitamins C (80 to 85 mg) and E (15 mg): "These two play an important role in fetal collagen production and supporting the mother's immune system," says Dr. Purdie. Large doses of vitamin C a day (over 2,000 mg) can cause symptoms like diarrhea, nausea and vomiting, so don't take additional supplements outside of what's in your prenatal without consulting your doctor.
Vitamin D: 15 mcg (600 IU). Vitamin D is important with developing fetal bones as well as aiding maternal bone health. "There are also emerging studies that suggest it aids in immunity and improves mood for the mother," says Dr. Purdie. If your doctor suspects you may not be getting enough Vitamin D, she may recommend an extra supplement.
Calcium: 1,000 to 1,300 mg. All women ages 19 to 50 need at least 1,000 mg per day of this crucial nutrient which, in the case of pregnant women, helps build your baby's bones and teeth.
Iron: 27 mg. During pregnancy, the amount of iron you need in a day greatly increases. This is because your body needs more iron in order to make more blood to supply oxygen to your baby. "Iron requirements in pregnancy increase, so supplementation is necessary to maintain adequate blood cell production," says Dr. Purdie. If, like many women, you become anemic during pregnancy, your doctor may recommend an iron supplement or a different prenatal vitamin with more iron.
Zinc: 11 to 12 mg. This mineral supports your immune system and healthy cell division.
DHA: Regular prenatal vitamins may not contain DHA, an omega-3 fatty acid found in many types of fish that aid in baby's brain development, both before and after birth. If you're unable to get the recommended two to three servings (8 to 12 ounces) of pregnancy-safe fatty fish per week, ask your doctor if you should take a supplement.
Other nutrients: You might also see several other additions on the label such as copper, choline, thiamin, vitamin B12, magnesium and ginger or vitamin B6 (both may help with morning sickness).