What to Eat While Breastfeeding

Your body can make nutritionally valuable milk on an imperfect diet. Many milk components are buffered against short-term dietary variation, while vitamin D, vitamin B12, iodine, thiamin, choline, and the omega-3 fat DHA are more responsive to maternal intake and status.¹²

The practical answer to “what should I eat for my baby’s health?” is: eat enough, eat a varied diet, and deliberately cover the nutrients that depend more heavily on maternal status.

Everything below is the detail behind that sentence.

This article summarizes published research and professional guidelines. It isn’t medical advice, and infant nutrition is one area where a real clinician matters. Talk to your pediatrician and your OB or midwife about supplements before starting anything — especially vitamin D dosing, which differs depending on whether you supplement yourself or the baby.

The Short Answer

Priority	What to do	Why
Vitamin D	Give a breastfed or partially breastfed infant 400 IU/day starting in the first days of life; discuss any maternal high-dose alternative with a clinician	Breast milk alone usually does not supply enough vitamin D3
Vitamin B12	Ask a clinician about supplementation if you eat vegan or have an absorption disorder	Milk B12 is highly responsive to maternal status14
Iodine	Aim for 290 µg/day; guidelines recommend a daily multivitamin or prenatal with 150 µg iodine	Requirements rise during lactation, and milk iodine reflects maternal status45
Omega-3 (DHA)	2–3 servings (8–12 oz) of lower-mercury fish per week	Current FDA/CDC guidance balances nutrients with mercury exposure46
Energy	Usually 330–400 extra kcal/day above pre-pregnancy intake	Needs vary with body size, activity, and exclusive versus mixed feeding4
Protein	Meet your full daily need; an older physiological estimate added ~20 g/day	The exact increment is not one universal target7
Fluids	Drink to thirst — no more	Extra fluid beyond thirst does not increase supply8
Elimination diets	Don’t, unless a clinician directs it	No evidence they prevent allergy or eczema9

Why Your Milk Isn’t a Straight Copy of Your Plate

Think of your mammary gland as a bank with two very different account types.

Some nutrients sit in a protected account. The gland pulls them from your body stores and, if needed, from your bones and tissue — and it keeps milk concentrations steady almost regardless of what you ate this week. Calcium, iron, folate, zinc, and copper work this way.¹

Others sit in a checking account. Their concentrations respond more strongly to maternal intake and status, although the relationship is not perfectly one-to-one.

Lindsay Allen, PhD — a research nutritionist at the USDA Agricultural Research Service Western Human Nutrition Research Center at UC Davis, and one of the field’s central figures — formalized this split. She calls them Group I nutrients (responsive to maternal status and intake) and Group II nutrients (buffered).¹

The distinction matters enormously, because it tells you where your effort actually goes.

How much a deficient mother’s milk short-changes her infant

Allen’s team estimated what percentage of an infant’s recommended daily intake they would get from the milk of a deficient mother. The numbers are stark:¹

Nutrient	Group	% of infant’s recommended intake supplied by a deficient mother’s milk
Vitamin B12	I	16%
Riboflavin (B2)	I	53%
Choline	I	56%
Thiamin (B1)	I	60%
Vitamin B6	I	80%
Folate	II	Largely maintained regardless of maternal status

Read the B12 row again. An infant fed exclusively by a B12-deficient mother receives roughly one-sixth of what they need. That is not a rounding error — it’s the mechanism behind the neurological cases that show up in the pediatric literature.

Folate, by contrast, is the control condition. Maternal folate status can drop and milk folate holds. That’s Group II behavior, and it’s why “just eat well overall” is genuinely adequate advice for a large share of nutrients.

The strategy is narrow and specific: focus effort on the responsive nutrients without assuming the rest of maternal nutrition no longer matters.

The Six That Matter Most

1. Vitamin D — the routine infant supplement

This is the exception to almost every other rule in this article, and it deserves to go first.

Breast milk alone usually does not provide enough vitamin D. Current CDC and AAP guidance says breastfed and partially breastfed infants should receive 400 IU/day of supplemental vitamin D, beginning in the first few days of life.¹⁰¹¹³ Children younger than 12 months need 400 IU/day in total; children 12–24 months need 600 IU/day.³

Bruce Hollis, PhD, and Carol Wagner, MD, at the Medical University of South Carolina ran a randomized trial comparing maternal supplementation with 6,400 IU/day against the standard approach of giving the infant 400 IU/day directly. In that six-month trial, the high maternal dose supplied enough vitamin D through milk to maintain infant vitamin D status.¹²

That result does not make 6,400 IU/day a do-it-yourself substitute for infant drops. CDC advises families who do not want to supplement the infant directly to discuss the risks and benefits of maternal high-dose supplementation with a health care provider.³

2. Vitamin B12 — the highest-stakes nutrient on the list

Milk B12 is the most maternally-dependent nutrient in the Group I set, and the consequences of getting it wrong land on a developing nervous system.

If you eat vegan or strictly vegetarian, have pernicious anemia, a gastrointestinal disorder, or a history of malabsorptive bariatric surgery, ask your health care provider about B12 testing and an appropriate supplement. CDC identifies these as higher-risk situations.⁴

Do not assume that continuing the same prenatal is automatically right for everyone. CDC notes that some prenatal products can exceed postpartum iron and folic-acid needs, while people with restricted diets may benefit from a multivitamin. Review the label and your individual needs with a clinician.⁴

Supplementation does move the needle. In a randomized, double-blind, placebo-controlled trial in Tanzania, Dan Wang and colleagues found that prenatal supplementation raised milk B12 concentrations by 34% at six weeks postpartum, while postnatal supplementation raised them by 16% at seven months.¹³ Both windows matter, and they matter at different times — prenatal loading covers the early weeks, ongoing intake covers the long haul.

Worth noting from that same trial: 73% of participants had milk B12 below the reference threshold at six weeks. Low milk B12 is not an exotic condition.

3. Iodine — 290 µg/day during lactation

Iodine is required for thyroid hormone production and supports infant growth and neurological development. The current U.S. recommended dietary allowance during breastfeeding is 290 µg/day.⁴⁵

Breast milk iodine varies with maternal iodine status. A systematic review by Shuyi Liu and colleagues reported a wide range across populations, but a milk concentration is not a home test or a substitute for dietary guidance.¹⁴

Practical version: use iodized salt if it fits your medical needs, include foods such as dairy, eggs, and seafood when appropriate, and check supplements carefully. The American Thyroid Association and AAP recommend a daily multivitamin or prenatal containing 150 µg of iodine during pregnancy and breastfeeding, but not every product contains it.⁵ More is not automatically better, particularly with thyroid disease.

4. Thiamin — a small deficiency with a dramatic ceiling

Thiamin makes this list because it demonstrates the Group I mechanism more vividly than anything else.

In rural Cambodia, where thiamin-poor white rice dominates the diet, infantile beriberi remains a genuine cause of infant death. Kyly Whitfield, PhD, and colleagues recruited pregnant women for a double-blind randomized trial of thiamin-fortified fish sauce consumed through late pregnancy and early lactation. At the end of the six-month intervention, milk thiamin was 14.4 µg/dL in the control group and 20.7 µg/dL in the low-concentration group, and infant thiamin status was also higher in the fortified groups.¹⁵

A condiment changed the milk. That’s how directly Group I nutrients pass through.

In a varied Western diet, frank thiamin deficiency is rare — whole grains, pork, legumes, and fortified foods cover it. The reason to know this: it’s the clearest proof that your milk isn’t insulated from your diet, and it’s a real risk if your intake is genuinely restricted for any reason.

5. Choline — under-consumed and under-discussed

Choline supports infant brain development and, like the B vitamins, appears in milk in amounts tied to maternal intake — an infant of a deficient mother gets roughly 56% of the recommended amount.¹ A recent meta-analysis mapped how milk choline concentration shifts across lactation stages, confirming it as an actively regulated but intake-sensitive component.¹⁶

Most people under-consume it because the richest sources are foods that spent two decades on the naughty list: egg yolks and liver, with soybeans, chicken, and cruciferous vegetables contributing meaningfully. Two eggs a day covers a large fraction of the requirement.

6. DHA — the nutrient your milk copies most literally

Milk fat composition is the most-studied maternal-diet effect in the entire literature, and it’s the clearest.

The updated systematic review by Iris Petersohn and colleagues at Wageningen University found maternal fish intake positively associated with milk ALA (r = 0.28–0.42), DHA (r = 0.24–0.46), and EPA (r = 0.25–0.28), with dietary polyunsaturated fats generally correlating with their milk concentrations — and saturated fat intake negatively associated with several milk fatty acids.²

The geographic data makes the same point. Pooling 78 studies across 41 countries and 4,163 milk samples, worldwide mean milk DHA was 0.37% of total fatty acids — but women with access to marine foods averaged 0.35% versus 0.25% for those without.¹⁷ Sheila Innis’s work at the University of British Columbia established the underlying mechanism: milk fatty acid profiles reflect both recent dietary intake and maternal adipose stores.¹⁸

Here’s where honesty is required, though.

Milk DHA responds to maternal diet, but that does not prove a supplement improves infant cognition. Shweta Khandelwal and colleagues randomized 957 Indian women to 400 mg/day of algal DHA beginning at or before 20 weeks of pregnancy and continuing through six months postpartum. At 12 months, infant development quotient scores were 96.6 in the DHA group versus 97.1 in placebo, with no significant difference.¹⁹ Because supplementation began during pregnancy, this trial does not isolate postpartum supplementation or breastfeeding exposure.

The ALSPAC cohort found that mothers eating less than 340 g of seafood per week during pregnancy had children at higher risk of several adverse developmental scores.²⁰ That was an observational pregnancy study. It cannot prove that seafood caused the outcomes, and it is not direct evidence about seafood intake during lactation.

For breastfeeding, use the current FDA/CDC advice directly: eat 2–3 servings, or 8–12 oz, per week from the FDA “Best Choices” list of lower-mercury fish, or one 4 oz serving from the “Good Choices” list.⁴⁶ Salmon, sardines, trout, and anchovies are among the lower-mercury options. Check local advisories for fish caught by family or friends.

What Matters Less Than You’ve Been Told

Drinking more water does not increase your supply

This is the single most repeated piece of breastfeeding advice, and it does not hold up. A Cochrane review by Chizoma Ndikom and colleagues searched for randomized evidence that extra fluids increase milk production and found essentially none — one low-quality quasi-randomized study, which reported that advising women to drink extra fluids did not improve milk production.⁸

Their conclusion: there isn’t enough evidence to support fluid intake beyond what you physiologically need, and because the mechanism isn’t plausible, further trials may not even be a priority.

Lactation does raise your fluid needs. Thirst handles it. Keep water within reach when you feed, because you’ll be thirsty — but forcing gallons is chasing an effect that isn’t there.

Elimination diets do not prevent allergies

Cutting dairy, eggs, nuts, or soy “just in case” is common and, for allergy prevention, unsupported. The AAP clinical report by Frank Greer, MD, Scott Sicherer, MD, and Wesley Burks, MD, is explicit: current evidence does not support maternal dietary restriction during pregnancy or lactation for preventing atopic disease.⁹

The same report discusses introducing allergenic foods as part of the infant’s complementary diet, not feeding solids to a newborn. CDC and AAP guidance places complementary foods at about 6 months, when the infant is developmentally ready, and says not to introduce them before 4 months.²¹ If an infant has severe eczema or an egg allergy, ask the pediatrician when and how to introduce peanut safely.

If your baby has genuine symptoms — blood in stool, severe reflux, significant eczema — that’s a clinical conversation, not a self-directed elimination. Restricting a nursing mother’s diet without cause makes an already-hard nutritional job harder.

Your diet does not need to be clean

Many macronutrient components of milk are relatively buffered, but maternal diet and status still affect specific nutrients and fatty acids.²²² CDC considers up to about 300 mg/day of caffeine a low-to-moderate intake that usually does not adversely affect an infant. Younger and preterm newborns clear caffeine more slowly, so their mothers may choose less if the infant becomes irritable or sleeps poorly.⁴

The same skepticism applies to the “anti-inflammatory diet” framing that gets marketed to postpartum women — as we’ve covered in our breakdown of when anti-inflammatory nutrition actually helps, the evidence is far narrower than the marketing.

How Much to Eat

Kathryn Dewey, PhD, of UC Davis estimated decades ago that exclusive breastfeeding costs about 670 kcal/day, with an assumed net dietary increment of roughly 500 kcal/day after accounting for mobilized maternal stores.⁷ That historical estimate is not the current one-size-fits-all public recommendation.

CDC currently recommends that well-nourished breastfeeding mothers generally consume 330–400 additional kcal/day compared with what they ate before pregnancy.⁴ The right amount varies with age, body mass index, activity level, and whether feeding is exclusive or mixed.

For protein, Dewey’s analysis estimated an increment of roughly 20 g/day above baseline once the protein cost of non-protein nitrogen in milk was included.⁷ Treat that as an older physiological estimate, not a universal add-on to a fitness-app target. A clinician or registered dietitian can account for your body size, usual intake, feeding pattern, health, and training.

The same review suggested that short-term milk output can be buffered across a range of maternal intakes, especially when maternal stores are adequate.⁷ That does not make prolonged restriction harmless. Maternal nutrition and health still matter even when milk volume appears stable.

SensAI does not track food intake, calculate lactation calories, or prescribe maternal supplements. Its LLM coach can remember user-stated preferences and constraints for training conversations, but it is not a lactation calculator. A clinician or registered dietitian should own individualized postpartum nutrition targets.

Losing Weight and Training While Breastfeeding

One short randomized trial examined dieting and aerobic exercise after lactation was established. Its narrow design matters.

Megan McCrory, PhD, and colleagues at UC Davis randomized 67 exclusively breastfeeding women at 12 ± 4 weeks postpartum into three groups for 11 days: a 35% energy deficit by diet alone (22 participants), a 35% net deficit by diet plus aerobic exercise (22 participants), or control (23 participants). Weight loss averaged 1.9 kg, 1.6 kg, and 0.2 kg, respectively.²³

The researchers detected no significant between-group differences in milk volume, composition, energy output, or infant weight during those 11 days.²³ “No significant difference” in a small, short trial does not prove equivalence or long-term safety.

The study’s body-composition estimates suggested that a larger share of weight loss came from fat in the diet-plus-exercise group than in the diet-only group.²³ That exploratory short-term result does not establish that a 35% deficit or rapid weight loss is advisable for breastfeeding people.

ACOG advises a gradual return to postpartum physical activity after an uncomplicated delivery, with individualized medical guidance, particularly after a cesarean birth or complications.²⁴ If you are returning to lifting after clearance, our beginner’s guide to strength training for women covers foundational movement patterns, and our post-workout nutrition guide covers general refueling once you are training again.

SensAI can generate and regenerate general training plans around user-stated goals, equipment, schedule, and constraints. It does not provide postpartum rehabilitation, assess pelvic-floor or incision healing, determine lactation safety, or decide when you are medically ready to increase volume. Put clinician-defined limits into the training conversation only after you have been cleared.

The McCrory trial ran 11 days, enrolled exclusively breastfeeding women around three months postpartum with established supply, and did not establish long-term effects on milk production, infant growth, maternal nutrient status, or people in the early postpartum weeks.²³ It should not be extrapolated into a crash diet or a six-month weight-loss plan.

The Recovery Problem Nobody Warns You About

Newborn sleep can change recovery in ways a training plan cannot infer from a wearable score alone.

Fragmented sleep can change resting heart rate, heart rate variability, fatigue, and perceived readiness. Those signals are nonspecific. They can reflect sleep loss, illness, stress, medication, hydration, or postpartum physiology, and they do not diagnose overtraining or determine whether exercise is medically safe.

Compare trends with your recent postpartum baseline rather than treating a pre-pregnancy number as a target. Our breakdown of how sleep debt shows up in HRV data explains how sleep disruption can affect wearable metrics.

SensAI’s LLM coach can remember a user-stated schedule or constraint and use aggregated recovery summaries as context for general training conversations. It cannot interpret postpartum symptoms, replace clinical clearance, or turn HRV into a postpartum readiness decision.

A Day That Covers the Bases

Not a meal plan — a checklist of what a covered day contains:

• Choline-rich foods such as eggs, dairy, meat, some seafood, beans, peas, and lentils, working toward 550 mg/day⁴
• Lower-mercury fish totaling 8–12 oz per week from the FDA “Best Choices” list⁴⁶
• An iodine plan that reaches 290 µg/day, using foods, iodized salt when appropriate, and a clinician-reviewed supplement if needed⁴⁵
• A dairy or fortified alternative serving (iodine, B12, calcium)
• Adequate protein across the day, with individual needs reviewed if you train or restrict foods⁷
• A clinician-reviewed supplement plan; if you use a multivitamin or prenatal, check the iodine and B12 content⁴⁵
• Vitamin D for a breastfed or partially breastfed infant, 400 IU/day beginning in the first days; discuss any maternal high-dose alternative with a clinician³
• Usually 330–400 kcal more than your pre-pregnancy intake, adjusted for your body, activity, and feeding pattern⁴
• Water when you’re thirsty, and no penalty when you’re not⁸

Reference values for what “adequate” actually looks like in milk have gotten much better recently — the multi-country MILQ study, led by Allen’s group, published the first robust reference values for B vitamins in human milk from healthy, well-nourished mother-infant pairs across four continents.²⁵ The field is finally measuring what it has been recommending.

Frequently Asked Questions

Does what I eat change my breast milk? Some milk nutrients are more responsive to maternal intake and status, including vitamin D, B12, iodine, thiamin, riboflavin, B6, choline, and omega-3 fats.¹² Others, including folate, calcium, iron, zinc, and copper, are more tightly buffered in milk, sometimes at the expense of maternal stores.¹ Neither group is perfectly independent of overall maternal health.

What supplement is routinely recommended for a breastfed newborn? Vitamin D. CDC recommends 400 IU/day for breastfed and partially breastfed infants beginning in the first few days of life.³ Maternal supplements are individualized: B12 needs special attention with vegan diets or absorption disorders, and iodine guidance recommends checking for 150 µg in a daily multivitamin or prenatal.⁴⁵

Do I need to drink more water to make more milk? No. A Cochrane review found no good evidence that fluids beyond thirst increase milk production.⁸ Lactation raises your fluid needs and thirst covers them.

Should I cut dairy or nuts to prevent my baby’s allergies? No, not preventively. The AAP’s clinical report states that current evidence does not support maternal dietary restriction during pregnancy or lactation for preventing atopic disease.⁹ If your baby has actual symptoms, work with your pediatrician rather than eliminating on your own.

Can I diet or exercise while breastfeeding without losing my supply? A trial of 67 exclusively breastfeeding women around 12 ± 4 weeks postpartum found no significant change in milk measures or infant weight during an 11-day, 35% energy-deficit intervention.²³ It was too short and narrow to establish long-term safety, early-postpartum safety, or an appropriate rate of weight loss. Get individualized guidance before dieting or resuming exercise.

How many extra calories do I need while breastfeeding? CDC’s current general recommendation is 330–400 additional kcal/day compared with pre-pregnancy intake for a well-nourished breastfeeding mother.⁴ Needs vary with body size, activity, and exclusive versus mixed feeding. An older physiological review estimated roughly 20 g/day additional protein, but individual protein needs should be assessed in the context of the full diet.⁷

Is fish safe while breastfeeding? Current FDA/CDC advice for breastfeeding is 2–3 servings, or 8–12 oz, per week from the lower-mercury “Best Choices” list, or one 4 oz serving from the “Good Choices” list.⁴⁶ The ALSPAC findings often cited here were observational and measured seafood during pregnancy, not lactation.²⁰

Do omega-3 supplements make my baby smarter? The evidence does not support that claim. A randomized trial of 957 women taking 400 mg/day of DHA from pregnancy through six months postpartum found no difference in offspring development scores at 12 months.¹⁹ Because exposure started during pregnancy, it does not isolate postpartum supplementation. Milk DHA responds to maternal intake, but that is a different outcome from infant cognition.²¹⁷

What are the current caffeine and alcohol limits? CDC describes up to about 300 mg/day of caffeine as a low-to-moderate intake that usually does not adversely affect an infant, although younger or preterm newborns clear caffeine more slowly.⁴ Not drinking alcohol is the safest option. Up to one standard drink in a day is not known to harm the infant; to be safest, wait at least 2 hours per drink before nursing. Pumping and discarding milk does not clear alcohol faster.²⁶

The Takeaway

The instinct to eat perfectly for your newborn comes from the right place. Breast milk buffers many short-term dietary gaps, sometimes by drawing on maternal stores, while several nutrients remain sensitive to maternal status.

The useful priorities are specific: follow infant vitamin D guidance; cover B12, iodine, thiamin, choline, and DHA; eat enough energy and protein; choose lower-mercury fish; and avoid unsupported elimination diets.

Everything you save by not chasing the perfect diet, spend on sleeping. That one you can’t supplement.

When you are medically ready to train again, SensAI can build a general program around the goals, equipment, schedule, and constraints you provide, then regenerate it from completed work and aggregated recovery context. It is not a lactation, nutrition, pelvic-floor, or postpartum medical tool, and wearable data is never medical clearance.

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References

Footnotes

1. Allen LH. “B vitamins in breast milk: relative importance of maternal status and intake, and effects on infant status and function.” Advances in Nutrition. 2012;3(3):362-369. https://pubmed.ncbi.nlm.nih.gov/22585913/ ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸

2. Petersohn I, Hellinga AH, van Lee L, Keukens N, Bont L, Hettinga KA, Feskens EJM, Brouwer-Brolsma EM. “Maternal diet and human milk composition: an updated systematic review.” Frontiers in Nutrition. 2024;10:1320560. https://pubmed.ncbi.nlm.nih.gov/38352250/ ↩ ↩² ↩³ ↩⁴ ↩⁵

3. Centers for Disease Control and Prevention. “Vitamin D and Breastfeeding.” Breastfeeding Special Circumstances, July 21, 2026. https://www.cdc.gov/breastfeeding-special-circumstances/hcp/diet-micronutrients/vitamin-d.html ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶

4. Centers for Disease Control and Prevention. “Maternal Diet and Breastfeeding.” Breastfeeding Special Circumstances, March 27, 2026. https://www.cdc.gov/breastfeeding-special-circumstances/hcp/diet-micronutrients/maternal-diet.html ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹ ↩¹² ↩¹³ ↩¹⁴ ↩¹⁵ ↩¹⁶ ↩¹⁷ ↩¹⁸ ↩¹⁹

5. Centers for Disease Control and Prevention. “Iodine and Breastfeeding.” Breastfeeding Special Circumstances, September 23, 2025. https://www.cdc.gov/breastfeeding-special-circumstances/hcp/diet-micronutrients/iodine.html ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶

6. U.S. Food and Drug Administration. “Advice about Eating Fish.” October 2021. https://www.fda.gov/food/consumers/advice-about-eating-fish ↩ ↩² ↩³ ↩⁴

7. Dewey KG. “Energy and protein requirements during lactation.” Annual Review of Nutrition. 1997;17:19-36. https://pubmed.ncbi.nlm.nih.gov/9240917/ ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶

8. Ndikom CM, Fawole B, Ilesanmi RE. “Extra fluids for breastfeeding mothers for increasing milk production.” Cochrane Database of Systematic Reviews. 2014;2014(6):CD008758. https://pubmed.ncbi.nlm.nih.gov/24916640/ ↩ ↩² ↩³ ↩⁴

9. Greer FR, Sicherer SH, Burks AW; Committee on Nutrition and Section on Allergy and Immunology. “The Effects of Early Nutritional Interventions on the Development of Atopic Disease in Infants and Children: The Role of Maternal Dietary Restriction, Breastfeeding, Hydrolyzed Formulas, and Timing of Introduction of Allergenic Complementary Foods.” Pediatrics. 2019;143(4):e20190281. https://pubmed.ncbi.nlm.nih.gov/30886111/ ↩ ↩² ↩³

10. Meek JY, Noble L; Section on Breastfeeding. “Policy Statement: Breastfeeding and the Use of Human Milk.” Pediatrics. 2022;150(1):e2022057988. https://pubmed.ncbi.nlm.nih.gov/35921640/ ↩

11. Wagner CL, Greer FR; American Academy of Pediatrics Section on Breastfeeding and Committee on Nutrition. “Prevention of rickets and vitamin D deficiency in infants, children, and adolescents.” Pediatrics. 2008;122(5):1142-1152. https://pubmed.ncbi.nlm.nih.gov/18977996/ ↩

12. Hollis BW, Wagner CL, Howard CR, Ebeling M, Shary JR, Smith PG, Taylor SN, Morella K, Lawrence RA, Hulsey TC. “Maternal Versus Infant Vitamin D Supplementation During Lactation: A Randomized Controlled Trial.” Pediatrics. 2015;136(4):625-634. https://pubmed.ncbi.nlm.nih.gov/26416936/ ↩

13. Wang D, Shahab-Ferdows S, Lweno ON, Hampel D, Method B, Yelverton CA, Nguyen CH, Aboud S, Allen LH, Fawzi WW. “The effects of prenatal and postnatal high-dose vitamin B-12 supplementation on human milk vitamin B-12: a randomized, double-blind, placebo-controlled trial in Tanzania.” American Journal of Clinical Nutrition. 2024;119(3):730-739. https://pubmed.ncbi.nlm.nih.gov/38432714/ ↩

14. Liu S, Sharp A, Villanueva E, Ma ZF. “Breast Milk Iodine Concentration (BMIC) as a Biomarker of Iodine Status in Lactating Women and Children <2 Years of Age: A Systematic Review.” Nutrients. 2022;14(9):1691. https://pubmed.ncbi.nlm.nih.gov/35565659/ ↩

15. Whitfield KC, Karakochuk CD, Kroeun H, Hampel D, Sokhoing L, Chan BB, Borath M, Sophonneary P, McLean J, Talukder A, Lynd LD, Li-Chan EC, Kitts DD, Allen LH, Green TJ. “Perinatal Consumption of Thiamine-Fortified Fish Sauce in Rural Cambodia: A Randomized Clinical Trial.” JAMA Pediatrics. 2016;170(10):e162065. https://pubmed.ncbi.nlm.nih.gov/27532780/ ↩

16. Yang M, Zhou Y, Wu S, Aihemaitijiang S, Li H, Liu J. “Choline concentration and composition in human milk across lactation stages: a systematic review and meta-analysis.” Critical Reviews in Food Science and Nutrition. 2026;66(6):1203-1212. https://pubmed.ncbi.nlm.nih.gov/40913782/ ↩

17. Fu Y, Liu X, Zhou B, Jiang AC, Chai L. “An updated review of worldwide levels of docosahexaenoic and arachidonic acid in human breast milk by region.” Public Health Nutrition. 2016;19(15):2675-2687. https://pubmed.ncbi.nlm.nih.gov/27056340/ ↩ ↩²

18. Innis SM. “Impact of maternal diet on human milk composition and neurological development of infants.” American Journal of Clinical Nutrition. 2014;99(3):734S-741S. https://pubmed.ncbi.nlm.nih.gov/24500153/ ↩

19. Khandelwal S, Kondal D, Chaudhry M, Patil K, Swamy MK, Metgud D, Jogalekar S, Kamate M, Divan G, Gupta R, Prabhakaran D, Tandon N, Ramakrishnan U, Stein AD. “Effect of Maternal Docosahexaenoic Acid (DHA) Supplementation on Offspring Neurodevelopment at 12 Months in India: A Randomized Controlled Trial.” Nutrients. 2020;12(10):3041. https://pubmed.ncbi.nlm.nih.gov/33023067/ ↩ ↩²

20. Hibbeln JR, Davis JM, Steer C, Emmett P, Rogers I, Williams C, Golding J. “Maternal seafood consumption in pregnancy and neurodevelopmental outcomes in childhood (ALSPAC study): an observational cohort study.” The Lancet. 2007;369(9561):578-585. https://pubmed.ncbi.nlm.nih.gov/17307104/ ↩ ↩²

21. Centers for Disease Control and Prevention. “When, What, and How to Introduce Solid Foods.” Infant and Toddler Nutrition, April 14, 2026. https://www.cdc.gov/infant-toddler-nutrition/foods-and-drinks/when-what-and-how-to-introduce-solid-foods.html ↩

22. Favara G, Maugeri A, Barchitta M, Lanza E, Magnano San Lio R, Agodi A. “Maternal Lifestyle Factors Affecting Breast Milk Composition and Infant Health: A Systematic Review.” Nutrients. 2024;17(1):62. https://pubmed.ncbi.nlm.nih.gov/39796495/ ↩

23. McCrory MA, Nommsen-Rivers LA, Molé PA, Lönnerdal B, Dewey KG. “Randomized trial of the short-term effects of dieting compared with dieting plus aerobic exercise on lactation performance.” American Journal of Clinical Nutrition. 1999;69(5):959-967. https://pubmed.ncbi.nlm.nih.gov/10232637/ ↩ ↩² ↩³ ↩⁴ ↩⁵

24. American College of Obstetricians and Gynecologists. “Physical Activity and Exercise During Pregnancy and the Postpartum Period: ACOG Committee Opinion, Number 804.” Obstetrics & Gynecology. 2020;135(4):e178-e188. https://pubmed.ncbi.nlm.nih.gov/32217980/ ↩

25. Allen LH, Shahab-Ferdows S, Moore SE, Peerson JM, Kac G, Figueiredo AC, Dror DK, Michaelsen KF, Islam MM, Nije F, Hampel D; MILQ Study Consortium. “Reference Values for B Vitamins in Human Milk: The Mothers, Infants and Lactation Quality (MILQ) Study.” Advances in Nutrition. 2025;16(Suppl 1):100500. https://pubmed.ncbi.nlm.nih.gov/41167833/ ↩

26. Centers for Disease Control and Prevention. “Alcohol.” Breastfeeding Special Circumstances, April 13, 2026. https://www.cdc.gov/breastfeeding-special-circumstances/hcp/vaccine-medication-drugs/alcohol.html ↩