7 min read
It is 3 a.m., the baby has finally latched, and you are suddenly starving. Nobody mentioned that breastfeeding can leave you hungrier than pregnancy did. Somewhere in the fog, you remember the half-empty bottle of prenatal vitamins in the bathroom cabinet and wonder whether you are still supposed to be taking them.
Quick answer: for many breastfeeding moms, continuing prenatal vitamins while breastfeeding is a sensible default, because lactation raises your needs for several nutrients, especially iodine and choline. The catch is that many prenatals contain little or no choline and some have no iodine at all, so the label matters more than the word “prenatal.” Your baby also needs their own vitamin D, and your OB, midwife, or pediatrician should help you fill in the details.
Here is what actually changes when you are feeding a baby, and the questions worth bringing to your next appointment.
[IMAGE: New mom holding a sleeping newborn at a kitchen table with a glass of water and a bowl of yogurt and fruit | alt: breastfeeding mom eating a snack, prenatal vitamins while breastfeeding]
Why Your Needs Go Up While Breastfeeding
Making milk is real work. The CDC recommends an extra 330 to 400 calories a day for well-nourished breastfeeding mothers compared with what you ate before pregnancy. That is roughly a peanut butter sandwich and a glass of milk, not a second dinner, but it explains the 3 a.m. hunger.
The same CDC guidance points out that recommended amounts of some nutrients rise during lactation, with iodine and choline at the top of the list. Your milk draws on what you eat and what you have stored, so a thin diet can leave your own reserves lower than you would like. Given how most new parents eat (standing up, one-handed, whatever is closest), gaps are common.
Should You Keep Taking Prenatal Vitamins While Breastfeeding?
For most people, a prenatal is a reasonable bridge into the postpartum months, and many providers suggest it. But not all prenatals are built the same, so before you assume you are covered, flip the bottle over and check two lines on the Supplement Facts panel.
Iodine
Breastfeeding women need 290 mcg of iodine a day, according to the CDC. Iodine helps your baby’s thyroid and developing brain, and your milk is how your baby gets it. The NIH Office of Dietary Supplements notes that the American Thyroid Association advises taking a supplement with at least 150 mcg of iodine during lactation. Yet when researchers looked at 59 top-selling prenatal supplements, only 34 contained any iodine.
If you cook with sea salt or Himalayan salt, or mostly eat packaged foods, you may be getting less iodine than you think. Those salts are usually not iodized, and neither is most salt in processed food.
Choline
Choline supports your baby’s developing brain and nervous system, and needs rise to 550 mg a day while breastfeeding. It is also one of the most overlooked nutrients in pregnancy nutrition. According to NIH, 90 to 95% of pregnant women take in less than the recommended amount, and prenatal supplements typically contain little if any choline.
That makes food important. One large egg has about 147 mg, and beef, chicken, fish, soybeans, and dairy all contribute. If eggs are on your breakfast rotation, you are already off to a good start.
Your Baby’s Vitamin D
This one surprises many parents. Breast milk is a wonderful food for babies, but according to the CDC it usually does not provide all the vitamin D a baby needs. The CDC recommends that breastfed and partially breastfed infants get 400 IU of vitamin D a day starting shortly after birth, usually as liquid drops. Your pediatrician will likely bring this up at an early visit.
You may have seen a different approach mentioned online: mom takes a high dose of vitamin D so the baby gets enough through her milk. That idea comes from real research. In a 2015 randomized trial published in Pediatrics, mothers who took 6,400 IU a day had babies with the same vitamin D status as babies who received 400 IU drops directly.
That study was done under close medical supervision, and 6,400 IU is well above the standard upper limit for adults. It is a conversation to have with your pediatrician and your own clinician, not something to try on your own. For most families, the drops remain the simple, standard route.
Iron, Protein, and Fish
Many new moms lose a meaningful amount of blood during delivery, and some start the postpartum period already low in iron from pregnancy. Fatigue is so universal with a newborn that low iron can hide in plain sight. If you are more exhausted than you expected or feel breathless on the stairs, ask for a blood test rather than guessing. Our post on taking iron without a blood test explains why ferritin is worth checking first.
Seafood is worth keeping on the menu, too. Fish provides protein, iodine, and omega-3 fats, and human milk contains DHA. CDC guidance allows two to three servings a week (8 to 12 ounces total) when the fish come from the FDA’s lower-mercury “Best Choices” list, which includes salmon, sardines, and cod. If you are wondering whether a fish oil capsule is a substitute, our look at whether fish oil is worth taking covers what the research actually shows.
If You Eat a Vegan or Mostly Plant-Based Diet
This is the group where a supplement conversation is not optional. Natural sources of vitamin B12 are limited to animal foods, and the CDC notes that breastfed babies of mothers who eat no animal products may have very limited B12. NIH warns that untreated B12 deficiency in infants can cause neurological damage, failure to thrive, and developmental delays.
The fix is straightforward: a reliable B12 supplement or fortified foods, planned with your provider. Iodine and choline deserve extra attention too, since eggs, dairy, and seafood are major sources of both.
Making It Doable With a Newborn
Advice is easy. Remembering anything on four hours of broken sleep is not. A few things that help real parents:
- Keep your supplements next to wherever you do the first feed of the day, along with a water bottle.
- Stock one-handed foods: hard-boiled eggs, cheese sticks, yogurt, trail mix, bananas, and leftover chicken.
- Say yes when someone offers to bring food. Ask for something with eggs or fish in it.
- Coffee is fine in moderation. The CDC considers up to about 300 mg of caffeine a day, roughly 2 to 3 cups of coffee, a low to moderate amount while breastfeeding.
If it keeps slipping your mind, our tips for building a vitamin habit that sticks work just as well at 5 a.m. with a baby on your shoulder.
Once you are done breastfeeding, your needs shift again. At that point some parents move from a prenatal to an everyday adult multivitamin. Ours, Vitamin100, is not a prenatal or postnatal and contains no iron, choline, or vitamin D, so it is not designed for this stage. Our page for parents on the go has more on what we make for the years after the newborn phase, and your provider can tell you when the switch makes sense.
Frequently Asked Questions
How long should I take prenatal vitamins after giving birth?
Many providers suggest continuing through breastfeeding, since iodine and choline needs stay high the whole time you are nursing. If you are not breastfeeding, your needs are closer to your pre-pregnancy baseline. Ask your OB or midwife what fits your situation, especially if you had significant blood loss.
Does my breastfed baby need vitamin D drops?
Yes, in most cases. The CDC recommends 400 IU a day for breastfed and partially breastfed infants, starting shortly after birth. High-dose maternal vitamin D is an alternative studied in research, but only under medical supervision.
Do I need extra calories while breastfeeding?
Usually a modest amount, about 330 to 400 extra calories a day according to the CDC. Letting hunger guide you and choosing protein-rich snacks is more practical than counting.
What should I look for on a prenatal label while nursing?
Check for iodine (at least 150 mcg is the American Thyroid Association’s advice) and look at how much choline, if any, is included. Most prenatals fall well short of the 550 mg choline target, so food still has to do a lot of the work.
The Bottom Line
Feeding a baby raises the bar for a few specific nutrients, not for everything. Keep taking a prenatal if your provider agrees, make sure it has iodine, lean on eggs, dairy, and fish for choline, and give your baby their vitamin D drops. Then be kind to yourself. A sandwich eaten in the dark at 3 a.m. counts.
Sources
- Maternal Diet and Breastfeeding, Centers for Disease Control and Prevention, 2026
- Vitamin D: Infant and Toddler Nutrition, Centers for Disease Control and Prevention, 2026
- Iodine: Fact Sheet for Health Professionals, NIH Office of Dietary Supplements, 2024
- Choline: Fact Sheet for Health Professionals, NIH Office of Dietary Supplements, 2022
- Vitamin B12: Fact Sheet for Health Professionals, NIH Office of Dietary Supplements, 2025
- Maternal Versus Infant Vitamin D Supplementation During Lactation: A Randomized Controlled Trial, Hollis et al., Pediatrics, 2015
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. This article is for general education and is not a substitute for advice from your healthcare provider.