When should I start taking prenatal vitamins?
Ideally, you'll start taking prenatal vitamins before conception. The baby's neural tube, which becomes the brain and spinal cord, develops during the first month of pregnancy — perhaps before you even know that you're pregnant.
How long should I take prenatal vitamins?
It's best to take prenatal vitamins throughout your entire pregnancy. Your health care provider might recommend continuing to take prenatal vitamins after the baby is born — especially if you're breast-feeding.
Do prenatal vitamins have any side effects?
Some women feel queasy after taking prenatal vitamins. If this happens to you, take your prenatal vitamin with a snack or before you go to bed at night.
In other cases, the iron in prenatal vitamins contributes to constipation. To prevent constipation:
- Drink plenty of fluids
- Include more fiber in your diet
- Include physical activity in your daily routine, as long as you have your health care provider's OK
- Ask your health care provider about using a stool softener
If these tips don't seem to help, ask your health care provider about other options. He or she might recommend another type of prenatal vitamin or separate folic acid, calcium with vitamin D, and iron supplements.
May 13, 2015
See more In-depth
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- Hochberg L, et al. Folic acid supplementation in pregnancy. http://www.uptodate.com/home. Accessed March 24, 2015.
- Smith JA, et al. Treatment and outcome of nausea and vomiting of pregnancy. http://www.uptodate.com/home. Accessed March 24, 2015.
- Haider BA, et al. Effect of multiple micronutrient supplementation during pregnancy on maternal and birth outcomes. BMC Public Health. 2011;11:s19.
- Oken E. Fish consumption during pregnancy. http://www.uptodate.com/home. Accessed March 24, 2015.
- Mulligan ML, et al. Implications of vitamin D deficiency in pregnancy and lactation. American Journal of Obstetrics and Gynecology. 2010;202:429.e.
- Constipation. National Digestive Diseases Information Clearinghouse. http://www.niddk.nih.gov/health-information/health-topics/digestive-diseases/constipation/Pages/treatment.aspx. Accessed March 24, 2015.
- Frequently asked questions. Pregnancy FAQ001. Nutrition during pregnancy. http://www.acog.org/Patients/FAQs/Nutrition-During-Pregnancy. American College of Obstetricians and Gynecologists. Accessed March 24, 2015.
- Zeratsky K (expert opinion). Mayo Clinic, Rochester, Minn. April 9, 2015.
- Duerbeck NM, et al. Prenatal vitamins: What is in a bottle? Obstetrical and Gynecological Survey. 2014;69:777.