Vitamin D for Breastfed Babies: How Much, How to Give It, and When to Stop
Breastfeeding offers many nutritional and health benefits for babies and mothers.
The American Academy of Pediatrics (AAP) recommends exclusive breastfeeding for approximately the first six months, followed by continued breastfeeding alongside complementary foods for two years or beyond, as mutually desired.
But breastfeeding isn't for everyone, and every family's feeding journey looks different!
This post isn't about how you choose to feed your baby. It's about one little nutrient that deserves some extra attention: vitamin D.
Whether you're exclusively breastfeeding, combining breast milk and formula, or preparing to introduce solids, you may be wondering whether your baby needs vitamin D drops, how to give them, and when you can stop.
As a pediatric pharmacist and mom, I'm here to help!
I breastfed my three tiny dinosaurs, and each experience was vastly different. Each baby and journey is unique, but the need to ensure they get the nutrients they need is universal.
Amid the excitement, exhaustion, and occasional chaos of bringing home a newborn, vitamin D supplementation can be easy to overlook. Fortunately, keeping your baby on track is usually pretty simple.
Why Is Vitamin D Important for Babies?
Breast milk is often called liquid gold, and for good reason! It provides essential nutrients, antibodies, and many other benefits for growing babies.
However, breast milk alone typically doesn't contain enough vitamin D to meet an infant's needs.
Vitamin D helps the body absorb calcium and phosphorus, two minerals essential for healthy bones and teeth. It also supports muscle function and the immune system.
Babies who don't get enough vitamin D risk developing rickets, a condition in which growing bones become soft and weak. Rickets can cause bone deformities, delayed growth, and other complications.
Fortunately, vitamin D deficiency-related rickets is largely preventable with adequate vitamin D intake.
Why Do Breastfed Babies Need Vitamin D Supplements?
Mothers obtain vitamin D through food, supplements, and sunlight. However, even when a breastfeeding mother has adequate vitamin D levels, her breast milk generally doesn't provide enough vitamin D to meet her baby's needs.
And let's be realistic. During those first few months with a newborn, I barely remembered to feed myself, let alone get outside and soak up some sunshine!
Babies also shouldn't rely on sun exposure to meet their vitamin D needs. Their delicate skin requires protection from ultraviolet radiation, especially during the first six months of life.
For more information about protecting your little one's skin, check out our guide to sunscreen for kids.
According to the AAP and Centers for Disease Control and Prevention (CDC), exclusively or partially breastfed infants should generally receive 400 international units (IU), equivalent to 10 micrograms (mcg), of vitamin D daily, beginning in the first few days of life. (*Note: In this article, we may refer to international units simply as "units" when describing doses.)
This recommendation helps prevent vitamin D deficiency and supports healthy bone development.
Vitamin D2 vs. Vitamin D3: Does the Type Matter?
Did you know there are two forms of vitamin D commonly found in supplements?
- Vitamin D2 (ergocalciferol): Usually derived from plant or fungal sources.
- Vitamin D3 (cholecalciferol): Often derived from animal sources, although plant-derived versions are also available.
The body converts both forms into compounds that help regulate calcium and phosphorus.
Research suggests that vitamin D3 is generally more effective than vitamin D2 at increasing and maintaining blood concentrations of 25-hydroxyvitamin D, the form used to assess vitamin D status.
However, both vitamin D2 and D3 can meet an infant's vitamin D needs when given at appropriate doses.
Vitamin D3 is common in infant supplements, but families following a vegan lifestyle can choose vitamin D2 or plant-derived vitamin D3 products.
The most important factor is choosing an appropriate infant formulation and giving the correct dose consistently.
How to Give Vitamin D Drops to Your Baby
For most healthy breastfed infants, the recommended vitamin D supplement dose is 400 international units (10 mcg) once daily.
Ideally, start supplementation within the first few days of life.
Forgot to start right away? It happens! Those early newborn days can feel like one very long, sleep-deprived blur. Start giving the recommended daily dose as soon as you can, and check with your pediatrician if you have questions.
Vitamin D supplements come in liquid form, which is convenient for babies who aren't quite ready to swallow pills. (Which is probably a good thing, considering they haven't mastered holding up their own heads yet.)
Check the concentration before giving vitamin D
Here's an important pharmacist tip: Not all vitamin D drops are created equal!
Some products contain:
- 400 units in 1 mL of liquid
- 400 units in just ONE drop
That's a pretty big difference!
A product that delivers 400 units in one drop is much more concentrated than one that requires a full milliliter.
Always read the product label carefully to determine how much liquid provides 400 units.
Use the measuring device supplied with your product, such as an oral syringe or calibrated dropper, when applicable. Never assume that the dosing instructions from one brand apply to another.
Giving too much vitamin D over time can cause toxicity, including elevated calcium levels and potentially serious complications.
Keep vitamin D supplements safely out of reach of children.
What's the best way to give vitamin D drops?
Depending on your product's instructions, you may have several options:
- Directly into your baby's mouth: Use the supplied measuring device and follow the manufacturer's administration instructions. Give the liquid slowly toward the inside of the cheek.
- On the breast before nursing: Some concentrated, single-drop products allow you to place a drop on the nipple before your baby latches.
- On a clean pacifier or bottle nipple: This may work for products specifically labeled for this method.
- Mixed with expressed breast milk or formula: Adding the measured dose to a small amount of milk can help ensure your baby receives the entire dose.
- Mixed with pureed food: Once your baby reliably eats solids, you may mix certain products into a small amount of food, according to the label.
Always follow the instructions for your specific product.
I had the best luck putting vitamin D drops on the breast or a pacifier. I tried adding vitamin D to bottles many times, but all three of my kids were picky about bottles and sometimes wouldn't finish them.
However, my strategy changed as they got older. After seven or eight months, they usually finished a bottle, but they were also very likely to take the pacifier and chuck it on the ground.
Parenthood is all about adapting, right??
Pharmacist tip: If you mix vitamin D with milk or food, use a small amount your baby will reliably finish rather than an entire bottle or meal.
For more tips about choosing medication formulations for children, check out our guide to liquid versus pill medications.
How do I choose a safe vitamin D supplement?
Choose a product specifically intended for infants from a reputable manufacturer.
Consider these factors:
- Clear dosing instructions: The label should clearly indicate how much liquid contains 400 units (10 mcg).
- Appropriate measuring device: Make sure you can accurately measure the prescribed or recommended dose.
- Independent quality testing: Certifications from organizations such as USP or NSF may provide additional reassurance about manufacturing quality and product contents.
- Simple ingredients: Review the ingredient list, particularly if your baby has known allergies or sensitivities.
Dietary supplements are regulated by the FDA but are not individually approved for safety and effectiveness before marketing.
A Good Manufacturing Practice (GMP) statement alone does not guarantee that a product has undergone independent testing.
Can Mom Take Vitamin D Instead of Giving Drops to Baby?
Here's something interesting: Families who have difficulty giving their babies vitamin D drops may have another option.
Research suggests breastfeeding mothers can take a higher daily dose of vitamin D, allowing enough to transfer through breast milk to meet their infants' needs.
In a randomized controlled trial published in Pediatrics in 2015, researchers evaluated 6400 international units of vitamin D3 daily for breastfeeding mothers as an alternative to directly supplementing infants with 400 international units daily.
The study found that maternal supplementation at this dose provided infants with vitamin D status comparable to direct infant supplementation.
The AAP's 2022 breastfeeding policy also recognizes this maternal supplementation strategy as an alternative.
However, there are important considerations.
A daily dose of 6400 units exceeds the usual adult tolerable upper intake level of 4000 units. Discuss this approach with a healthcare professional before starting.
Your medical team may consider:
- Whether you have a history of kidney stones, elevated calcium levels, kidney disease, or other relevant medical conditions
- Whether you already take prenatal vitamins or other supplements containing vitamin D
- Whether you have vitamin D deficiency or another reason for individualized supplementation
- Whether laboratory monitoring would be appropriate
- Whether direct infant supplementation or maternal supplementation is easier to maintain consistently
The research primarily evaluated exclusively breastfeeding mothers, so the findings shouldn't automatically be applied to every combination of breastfeeding and formula feeding.
For most families, giving the infant 400 units directly remains the simplest routine approach.
You can read the original maternal versus infant vitamin D supplementation trial for more information.
Does My Baby Still Need Vitamin D if We Introduce Formula?
Many families introduce formula while continuing to breastfeed.
Maybe you're returning to work, your milk supply has changed, or you simply need someone else to handle a feeding while you get a little sleep. All perfectly reasonable!
Infant formula is fortified with vitamin D, but whether it provides enough depends on how much your baby drinks.
According to CDC guidance, babies who drink less than 32 ounces (about 1 liter) of vitamin D-fortified formula daily generally need an additional vitamin D supplement.
The AAP's 2022 breastfeeding policy uses a somewhat lower threshold of approximately 28 ounces.
For babies receiving both breast milk and formula, especially those approaching these amounts, ask your pediatrician whether they still need a separate supplement.
The important point is that introducing some formula doesn't automatically eliminate the need for vitamin D drops.
What Happens When My Baby Starts Eating Solid Foods?
Introducing solid foods is an exciting milestone!
Unfortunately, most babies won't consume enough vitamin D through solid foods alone during their first year.
Vitamin D is naturally present in relatively few foods, including fatty fish and egg yolks. Some foods are fortified with vitamin D, but amounts vary.
Continue your baby's vitamin D supplementation plan as you introduce solids.
When can I stop giving my baby vitamin D drops?
This depends on your child's age, feeding pattern, and vitamin D intake from diet.
The recommended total daily vitamin D intake is:
- Birth through 11 months: 400 units (10 mcg)
- 12 through 24 months: 600 units (15 mcg)
After your baby's first birthday, the recommended daily intake increases, but that doesn't necessarily mean every toddler needs a 600 IU supplement.
Children may obtain vitamin D through fortified milk, other fortified foods, and dietary sources.
If your toddler drinks plant-based milk instead of cow's milk, check the nutrition label. Vitamin D content varies by product.
And remember, cow's milk or fortified plant-based milk generally shouldn't replace breast milk or infant formula as the main milk source before 12 months.
Your pediatrician can help determine when a separate supplement is no longer necessary.
Frequently Asked Questions About Vitamin D for Breastfed Babies
What if I forget to give my baby vitamin D?
Forgot a dose? It happens!
Follow your product's missed dose instructions or ask your pharmacist how to proceed. Avoid doubling doses to make up for missed days unless your healthcare provider specifically recommends it.
Try linking vitamin D administration to a regular daily feeding to make it easier to remember.
What if I accidentally give my baby too many vitamin D drops?
First, check the product concentration and determine how much vitamin D your baby may have received.
A single extra drop is very different from accidentally giving a full dropper of a concentrated product.
If you think your baby received more than the recommended amount, contact your pediatrician or Poison Control at 1-800-222-1222 in the United States for individualized guidance.
Repeated excessive doses can cause vitamin D toxicity, including dangerously high calcium levels.
If your baby has severe symptoms such as a seizure, difficulty breathing, or loss of consciousness, call 911.
Can I give vitamin D drops with other medications?
Vitamin D can generally be administered alongside many commonly used infant medications, but certain medications and medical conditions can affect vitamin D metabolism or requirements.
For example, some antiseizure medications can affect vitamin D levels.
Always tell your pediatrician or pharmacist about the medications and supplements your baby receives, including products that already contain vitamin D.
Do premature babies need the same amount of vitamin D?
Premature infants may have different nutritional and supplementation needs, particularly if they have complex medical conditions or receive specialized formulas or fortified breast milk.
Follow the individualized vitamin D recommendations provided by your baby's neonatal or pediatric care team.
The Bottom Line: Vitamin D Is Essential for Breastfed Babies
Breast milk provides remarkable nutrition, but it generally doesn't supply enough vitamin D on its own.
For most healthy infants who are exclusively or partially breastfed, 400 units (10 mcg) of vitamin D daily, beginning in the first few days of life, helps support healthy bones and prevent deficiency.
Choose a reputable infant vitamin D product, check the concentration carefully, and find an administration method that works for your family.
If your baby gets a lot of formula, has special medical needs, or you're interested in maternal vitamin D supplementation instead, talk with your healthcare team.
And remember, whether your feeding journey involves breastfeeding, formula, pumping, or a little bit of everything, you're doing an important job caring for your baby.
Keep on rockin' it, Mom and Dad!
Frequently Asked Questions
What if I forget to give my baby vitamin D?
Forgot a dose? It happens! Follow your product's missed dose instructions or ask your pharmacist how to proceed. Avoid doubling doses to make up for missed days unless your healthcare provider specifically recommends it. Try giving vitamin D at the same time each day to help establish a routine.
What if I accidentally give my baby too many vitamin D drops?
Check the product concentration to determine how much vitamin D your baby received. Some products contain 400 units in one drop, while others contain 400 units in an entire milliliter. If you suspect an extra dose, contact your pediatrician or Poison Control at 1-800-222-1222 for guidance. Excessive vitamin D can cause dangerously high calcium levels.
Can I give vitamin D drops with other medications?
Vitamin D can generally be given alongside many commonly used infant medications. However, certain medications, including some antiseizure medications, can affect vitamin D metabolism or requirements. Tell your pediatrician or pharmacist about all medications and supplements your baby receives, especially products that already contain vitamin D.
References
- Centers for Disease Control and Prevention. Vitamin D and Breastfeeding. Breastfeeding Special Circumstances.
- Centers for Disease Control and Prevention. Vitamin D. Infant and Toddler Nutrition.
- Meek JY, Noble L. Policy Statement: Breastfeeding and the Use of Human Milk. Pediatrics. 2022;150(1). https://doi.org/10.1542/peds.2022-057988
- Hollis BW, Wagner CL, Howard CR, et al. Maternal Versus Infant Vitamin D Supplementation During Lactation: A Randomized Controlled Trial. Pediatrics. 2015;136(4):625–634. https://doi.org/10.1542/peds.2015-1669
- National Institutes of Health, Office of Dietary Supplements. Vitamin D: Fact Sheet for Health Professionals.
- U.S. Food and Drug Administration. Questions and Answers on Dietary Supplements.
- American Academy of Pediatrics. Vitamin D and Iron Supplements for Babies. HealthyChildren.org.
