Are You Getting the Right Nutrients During Pregnancy?

Pregnancy is one of the most nutritionally demanding periods in a woman's life. Yet research consistently shows that most pregnant women fall short on at least a few critical nutrients sometimes without even knowing it. Here is what science says you need, and why it matters more than you might think.

Start Before You Even Conceive

The most important prenatal nutrient “folic acid” needs to be in your system before pregnancy begins. The U.S. Preventive Services Task Force recommends that all women of reproductive age take at least 400 micrograms daily, starting at least one month before conception and continuing through the first few months of pregnancy. Why so early? The neural tube, which becomes the brain and spinal cord, closes within the first 28 days of pregnancy often before a woman even knows she is pregnant. A Norwegian cohort study found that folic acid supplementation before and during pregnancy cut the risk of neural tube defects nearly in half.

Women who have previously had a pregnancy affected by a neural tube defect, or who have certain seizure disorders, need a much higher dose 4 mg daily and should discuss this with their doctor well before trying to conceive.

Iron: More Than Just Energy

Fatigue during pregnancy is common, but low iron can make it significantly worse and the consequences go beyond how you feel. Iron supports fetal growth and helps prevent maternal anemia. The recommended intake jumps to 27 mg per day during pregnancy, up from 18 mg normally. A Cochrane review confirmed that daily iron and folic acid supplementation reduces the risk of both maternal anemia and low birth weight. Most standard prenatal vitamins meet this requirement, but your doctor should check your levels throughout pregnancy.

Calcium and Vitamin D Work Together

Your baby is building an entire skeleton, and it draws the calcium it needs from you. Adults need 1,000 mg of calcium daily during pregnancy, and teenagers need even more at 1,300 mg. Vitamin D is equally important, it helps the body absorb calcium and supports bone development. Here is the catch: most prenatal vitamins only contain 200 to 300 mg of calcium and around 400 IU of vitamin D, which means diet still matters enormously. Dairy products, fortified plant milks, leafy greens, and sensible sun exposure all help fill the gap.

Two Nutrients Most Prenatal Vitamins Miss

This is where many women are caught off guard.

Choline is critical for fetal brain development and has been linked to significantly better pregnancy outcomes, yet research shows that only about 11% of pregnant women get enough of it. To make things worse, most prenatal vitamins contain little to no choline. As per Dietary Guideline of America (DGA) 2020-2025, adequate level of choline for pregnant women is 450 mg/day. Eggs, liver, and fish are the richest dietary sources if those are not part of your regular diet, a separate choline supplement is worth discussing with your provider.

DHA, an omega-3 fatty acid, is equally important for fetal brain and eye development. A large Cochrane review of 70 clinical trials found that DHA supplementation during pregnancy reduces the risk of preterm birth and low birth weight. The recommendation is at least 200 mg per day, ideally from low-mercury fish such as salmon, tilapia, anchovies, and catfish, two to three times per week or a dedicated DHA supplement.

What About Iodine and B12?

Iodine supports both your thyroid and your baby's, and the recommended intake during pregnancy rises to 250 micrograms per day. Many prenatal vitamins include iodine, but it is worth checking the label.

Vitamin B12 is especially important for women following vegan or vegetarian diets, as it is found almost exclusively in animal products. B12 deficiency during pregnancy can affect neurological development, so supplementation is essential for those who do not eat meat, dairy, or eggs.

Does a Prenatal Vitamin Cover Everything?

A good prenatal vitamin is your foundation, not your entire strategy. Research involving nearly 99,000 women found that prenatal multivitamin use was associated with meaningful reductions in neural tube defects, cardiovascular defects, and small-for-gestational-age births. Taking a multivitamin that also includes iron and folic acid reduced low birth weight risk compared to taking iron and folic acid alone.

But as noted above, choline and DHA are frequently missing or underdosed in standard prenatal vitamins. Reading labels and filling those gaps through diet or additional supplements is part of the picture.

One important warning: more is not always better. Vitamin A is essential during pregnancy, but too much of the preformed kind found in supplements can increase the risk of birth defects affecting the brain and heart. This risk does not apply to beta-carotene from food. Stick to the amount in a single prenatal vitamin and never take extra doses without talking to your healthcare provider first.

Special Situations That Need Extra Attention

Some women need a more tailored approach. Those who have had bariatric surgery may have impaired absorption of several nutrients and need specialized supplementation. Women carrying multiples, those with anemia, and those following vegan diets all have modified needs that a standard prenatal vitamin may not address. If any of these apply to you, a conversation with your OB or a registered dietitian is especially valuable.

Frequently Asked Questions: Prenatal Nutrition and Supplementation

1. When should I start taking prenatal vitamins?

Ideally, before you even try to conceive. Folic acid needs to be in your system at least one month before conception because the neural tube, which develops into your baby's brain and spinal cord closes within the first 28 days of pregnancy, often before you even know you are pregnant. If your pregnancy is unplanned, start a prenatal vitamin as soon as you find out and talk to your doctor right away.

2. How much folic acid do I actually need?

For most women, 400 to 800 micrograms per day is sufficient. However, if you have previously had a pregnancy affected by a neural tube defect, or if you take certain medications for seizure disorders, your doctor may recommend as much as 4 mg per day. This higher dose should come from a separate folic acid supplement rather than simply taking multiple prenatal vitamins, as doing so could lead to dangerously high levels of vitamin A.

3. Does my prenatal vitamin cover everything I need?

It covers most of the basics — folic acid, iron, iodine, and some calcium and vitamin D but probably not everything. Two nutrients that are frequently missing or underdosed in standard prenatal vitamins are choline and DHA. Research shows that only about 11% of pregnant women get enough choline, and most prenatal vitamins contain little to none of it. DHA is similarly absent or insufficient in many formulas. Read your label carefully and ask your doctor about filling those gaps.

4. What is choline and why does it matter during pregnancy?

Choline is a nutrient that plays a critical role in fetal brain development. Higher maternal choline levels have been associated with nearly 49% lower odds in adverse pregnancy outcomes. Despite how important it is, it is one of the most overlooked prenatal nutrients. The recommended intake during pregnancy is 450 mg per day. The richest dietary sources are eggs, liver, and fish. If those foods are not a regular part of your diet, ask your doctor about a separate choline supplement.

5. What is DHA and do I really need it?

DHA is an omega-3 fatty acid that supports your baby's brain and eye development. A large review of 70 clinical trials found that DHA supplementation during pregnancy reduces the risk of preterm birth and low birth weight, benefit appears most pronounced in women with low baseline omega-3 status. The general recommendation is at least 200 mg per day. You can get this from eating low-mercury fish two to three times per week, good options include salmon, sardines, and trout or from a dedicated DHA supplement if your dietary intake is low.

6. How much iron do I need during pregnancy?

The recommended daily intake of iron during pregnancy is 27 mg per day, up from the usual 18 mg for non-pregnant women. Most standard prenatal vitamins include this amount. Iron supports fetal growth and helps prevent maternal anemia, which can cause significant fatigue and complications. Your doctor should check your iron levels at prenatal visits, as some women, particularly those carrying multiples or those who were already low before pregnancy may need additional supplementation.

7. Can I get too much of certain vitamins during pregnancy?

Yes, and this is an important point that often gets overlooked. Vitamin A is essential during pregnancy, but the recommended daily intake according to the Dietary Reference Intakes is 750 micrograms per day for pregnant women ages 14 to 18, and 770 micrograms per day for those ages 19 to 50. Exceeding recommended levels can be harmful to a developing baby, so it is important to stay within these guidelines rather than assuming more is better. This is also one of the key reasons why women who need higher folic acid doses should take it as a separate supplement rather than simply doubling up on prenatal vitamins, doing so risks pushing vitamin A intake above safe levels. Always talk to your doctor before adding any new supplement to your routine during pregnancy.

8. I follow a vegan diet. Do I need anything extra?

Yes. Vitamin B12 is found almost exclusively in animal products, and deficiency during pregnancy can seriously affect your baby's neurological development. Supplementation is essential if you do not eat meat, dairy, or eggs. You may also need additional vitamin D, iron, calcium, and DHA from algae-based sources rather than fish oil. A consultation with your doctor or a registered dietitian is strongly recommended to make sure your specific dietary pattern is fully covered.

9. I had bariatric surgery. Does that affect my prenatal nutrition needs?

Significantly, yes. Bariatric surgery can impair the absorption of several key nutrients, including iron, calcium, vitamin D, vitamin B12, and folate. A standard prenatal vitamin is unlikely to be sufficient on its own. You should work closely with both your OB and a dietitian to develop a supplementation plan that accounts for your specific surgery type and absorption capacity. Monitoring your nutrient levels through blood tests throughout pregnancy is especially important.

10. Is it safe to take a prenatal vitamin if I am not pregnant but might become pregnant?

Absolutely — and it is actually encouraged. ACOG recommends that all women of reproductive age between 15 and 45 consider taking a daily supplement containing at least 400 micrograms of folic acid, regardless of whether they are actively trying to conceive. Since nearly half of pregnancies are unplanned, having adequate nutrient stores already built up provides important protection for an unborn baby from the very earliest days of development.

11. Do prenatal vitamins reduce the risk of miscarriage?

Research suggests they may. ACOG notes that prenatal vitamin use is associated with a lower risk of miscarriage, and a large systematic review found meaningful reductions in the risk of neural tube defects, cardiovascular defects, and small-for-gestational-age births among women who took prenatal multivitamins. While a prenatal vitamin is not a guarantee against pregnancy loss, the overall evidence points to meaningful protective benefits.

12. What should I look for on a prenatal vitamin label?

At minimum, look for folic acid at 400 to 800 mcg, iron at around 27 mg, iodine at 150 to 250 mcg, vitamin D at 400 to 600 IU, and calcium. Then check whether it includes choline and DHA, if it does not, consider adding those separately. For vitamin A, confirm the amount aligns with the recommended daily intake of 750 micrograms for ages 14 to 18, or 770 micrograms for ages 19 to 50, and avoid supplements that push significantly beyond these amounts. When in doubt, bring the label to your next prenatal appointment and go through it with your provider.

Take Action Now - Not Later

You do not have to wait until you see a positive pregnancy test to start protecting your baby's health. If there is any chance you could become pregnant, start taking a quality prenatal vitamin with at least 400 micrograms of folic acid today. Then go a step further check the label for choline and DHA, and if they are missing, ask your doctor about adding them separately.

Book an appointment with your healthcare provider to review your full supplement routine, get your iron and vitamin D levels checked, and talk through any dietary restrictions that might put you at higher risk for deficiency.

Your baby's brain, spine, bones, and heart begin forming in the very first weeks of life. The choices you make before and during pregnancy are among the most powerful health decisions you will ever make.

Book an appointment with Hita Nutrition & Wellness, Cedar Park Dietitian today!

Disclaimer: This article is for educational purposes and is not a substitute for personalized medical or nutrition advice. Please consult your healthcare provider before making significant changes to your diet, especially if you have existing health conditions.

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