The breastfeeding period is a phase of intensive nutrient transfer: what the mother eats significantly influences what the baby receives through breast milk. Particularly important is the long-chain omega-3 fatty acid DHA (docosahexaenoic acid), which occurs naturally in breast milk and is important for the brain and eye development of the infant. Since the baby's brain continues to grow intensively after birth — especially in the first months of life — DHA supply via breast milk is not a peripheral concern but a central aspect of good breastfeeding nutrition. This article explains what research and guidelines say about omega-3 intake during breastfeeding, how the DHA content of breast milk can be influenced, and what to look out for when supplementing. As always: discuss any supplements with your doctor.
DHA in breast milk: natural transfer to the baby
Breast milk is the food best adapted to the needs of the newborn. It contains not only macronutrients, vitamins and minerals, but also bioactive fatty acids — including DHA. The DHA content of breast milk is not constant, however: it varies considerably depending on the mother's diet.
How much DHA does breast milk contain?
Studies show that DHA content in breast milk varies greatly worldwide — from below 0.1% of total fatty acids in inland populations with little fish consumption to over 1% in societies with high sea fish intake, such as Japan or Canada. In the United Kingdom and other Northern European countries, the average DHA content in breast milk is in the lower to middle range, as fish consumption in the general population is often below recommendations.
This strongly diet-dependent content has an immediate practical consequence: mothers who eat little oily fish, or who follow a plant-based diet, tend to have DHA-poorer breast milk than mothers with high fish consumption. This can be addressed through targeted dietary change or supplementation.
EFSA Health Claim: DHA during breastfeeding
The European Food Safety Authority (EFSA) has approved the same health claim for breastfeeding as for pregnancy: "Maternal intake of DHA contributes to the normal development of the brain and eyes of breastfed infants."
Requirement: the breastfeeding mother takes at least 200 mg DHA daily in addition to the general recommendation of 250 mg EPA+DHA — i.e. a total of at least 450–600 mg daily. This claim expressly extends to the breastfeeding period, as the infant's brain continues to grow after birth and draws DHA from breast milk.
Why is DHA so important for the baby after birth?
Postnatal brain growth
A newborn's brain is still far from its final size at birth. In the first two years of life, rapid growth takes place: the brain triples its weight by the second birthday. During this phase, billions of new neural connections are formed, myelin sheaths are built and complex networks established. DHA is a key building block of these processes: as the predominant fatty acid in the phospholipids of nerve cell membranes and as a component of myelin, sufficient DHA is particularly important during this period.
Retina and visual development
The infant's retina also contains high concentrations of DHA in the photoreceptor cells. Studies show that the DHA content of the retina continues to develop in the first months of life and is strongly dependent on DHA availability. Breastfed children with DHA-richer breast milk show better results in visual acuity tests in the first months of life compared to children fed with DHA-poorer nutrition in some studies.
What do studies say about DHA supplementation during breastfeeding?
Maternal DHA supplementation increases DHA in breast milk
This relationship is well established: when breastfeeding mothers take DHA-containing supplements or eat more oily fish, the DHA content in their breast milk demonstrably rises. The response is dose-dependent — higher DHA intake leads to higher DHA content in breast milk. This is one of the most direct and clearly reproducible links between maternal diet and the nutrient content of breast milk.
Carlson et al.: Prenatal and postnatal DHA supply and cognitive development
An important research group in this field is that of Susan Carlson at the University of Kansas, which has been researching DHA and neurological development for many years. A meta-analysis combining multiple intervention studies with DHA supplementation in the perinatal period (before and after birth) provided consistent evidence that better DHA supply is associated with positive effects on cognitive developmental parameters — particularly in preterm infants, who are more vulnerable in their DHA supply than term infants.
Maternal DHA supplementation and cognitive development of the child
A meta-analysis of intervention studies with maternal DHA supplementation found that improved DHA supply in the perinatal period — before and immediately after birth — was associated with significantly better cognitive development in preterm infants at 12 to 24 months of age, including motor and language milestones. Sub-group analysis: DHA doses of at least 800 mg daily, started before the 20th week of pregnancy, showed the strongest effects.
DHA fortification of infant formula as a reference point
Further evidence of DHA's importance for breastfed and non-breastfed infants comes from infant formula research: since 2002, the fortification of infant formula with DHA and ARA (arachidonic acid) has been mandatory in the EU — precisely because the evidence for their importance in early development was considered sufficiently strong. This underlines why the DHA content of breast milk should not be left to chance either.
Recommendations from health authorities
EFSA, the WHO/FAO, and the International Society for the Study of Fatty Acids and Lipids (ISSFAL) all recommend increased DHA intake for breastfeeding women. The consistent recommendation is:
- 200 mg DHA daily in addition to the general adult recommendation (250 mg EPA+DHA)
- Preferred dietary source: 1–2 portions of oily sea fish per week (salmon, herring, mackerel, sardines)
- Where dietary intake is insufficient: supplementation with tested fish oil or algae oil
These recommendations are internationally consistent and align with the EFSA position approved for use in the EU.
Diet vs. supplementation during breastfeeding
When diet is sufficient
Those who regularly eat oily sea fish — two portions per week as a guideline — can generally meet the recommended additional DHA requirements during breastfeeding through diet alone. Supplementation may then not be strictly necessary. However, DHA content in fish varies considerably depending on origin, farming conditions and preparation, so a purely diet-based supply is not always reliably predictable.
When supplementation may be appropriate
The following situations support additional DHA supplementation during breastfeeding based on current evidence:
- Vegetarian or vegan diet: No fish consumption means no direct EPA/DHA intake. Algae oil is the recommended alternative here.
- Low fish consumption: Those who eat less than one portion of fish per week can rarely meet the additional requirements through diet alone.
- Preterm babies: Premature infants have a particularly high DHA requirement in the first months of life and depend on DHA-rich breast milk or enriched special formula.
- Multiple breastfeeding: With twins or triplets, the mother's overall nutritional requirements are increased.
| Situation | DHA requirement (additional) | Recommended source |
|---|---|---|
| Omnivore diet, 2x fish/week | +200 mg/day (EFSA) | Diet sufficient, optional supplement |
| Low fish consumption (<1x/week) | +200 mg/day | Fish oil or algae oil recommended |
| Vegetarian/vegan | +200 mg/day | Algae oil (DHA-rich) recommended |
| Premature baby | Increased requirement | Medical consultation, potentially higher dose |
| Multiple births | Increased overall requirement | Medical consultation |
Safety of omega-3 supplements during breastfeeding
High-quality fish oil and algae oil supplements are considered safe during breastfeeding at standard dosages (200–600 mg DHA+EPA daily). The following aspects are important:
Freedom from heavy metals and purity
Fish oils undergo a purification process (molecular distillation) that removes heavy metals such as mercury as well as contaminants such as PCBs and dioxins. High-quality products are tested for these contaminants by independent laboratories and carry corresponding certificates (e.g. IFOS — International Fish Oil Standards). Selecting a tested product is particularly important during breastfeeding, as contaminants could theoretically also pass into breast milk.
Cod liver oil during breastfeeding: not recommended
Cod liver oil is a traditional omega-3 source but contains, alongside EPA and DHA, very high amounts of vitamin A (retinol) and vitamin D. Whilst vitamin D is important during breastfeeding, retinol in large quantities can be toxic. Health authorities therefore recommend purified fish oil or algae oil rather than cod liver oil during breastfeeding, to avoid vitamin A overdosage.
Avoid cod liver oil during pregnancy and breastfeeding
Cod liver oil contains very high amounts of vitamin A (retinol), which in large doses can be harmful during pregnancy and breastfeeding. For these life phases, choose purified fish oil or algae oil that is free from excessive vitamin A. Check the product label carefully and discuss the choice with your doctor.
Algae oil as a vegan alternative
Algae oil is derived directly from DHA-rich marine algae — the original source from which fish also obtain their DHA. It contains no mercury and is free of fish proteins, making it suitable for people with fish allergies too. Studies show that DHA from algae oil is comparably bioavailable in the body to DHA from fish oil. For mothers who follow a vegan or vegetarian diet, algae oil is the recommended DHA source during breastfeeding.
The mother's own omega-3 needs during breastfeeding
An important but often underestimated aspect: omega-3 is not only important for the baby — the mother also has an increased DHA requirement during breastfeeding. On one hand, because she is transferring DHA through breast milk; on the other, because DHA and EPA matter for her own health — for heart, brain and mood regulation.
Omega-3 and postpartum mood
Some studies have observed that women with low omega-3 status after birth more frequently develop low mood. The biological background is plausible: DHA is present in high concentrations in the brain and plays a role in neurotransmitter synthesis. By transferring DHA through breast milk, maternal DHA levels may fall — particularly if intake is insufficient. Intervention studies on omega-3 in postpartum depression show some positive effects, but research is not yet complete. Good omega-3 supply during breastfeeding appears sensible from multiple perspectives.
Further information on omega-3 and the brain can be found in our article on Omega-3 and the brain. Anyone wishing to start optimising their omega-3 supply during pregnancy will find all relevant information in the article Omega-3 for pregnant women.
Practical tips: optimising omega-3 during breastfeeding
Through diet
Health authorities recommend at least one to two portions of oily sea fish per week. Particularly suitable are salmon, herring, mackerel and sardines — they are rich in DHA and EPA and have low contaminant levels compared to large predatory fish. Tuna should be consumed in moderation during breastfeeding due to potentially elevated mercury levels (especially tinned tuna in large quantities). Fresh or frozen tuna generally contains more mercury than other fish species.
Through supplements
If diet does not adequately cover DHA requirements, supplementation with tested fish oil or algae oil is a practical option. High-quality products for pregnant and breastfeeding women typically contain 200–500 mg DHA per daily dose and are tested for freedom from contaminants. Choose a product with transparent quality certificates. More on evaluating the quality of omega-3 products can be found in our buying guide.
How long should I supplement omega-3 during breastfeeding?
The EFSA recommendation applies for the entire breastfeeding period, as the child's brain continues to draw DHA from breast milk throughout. Many experts recommend maintaining supplementation for the entire duration of breastfeeding — or at least as long as the child is exclusively breastfed and not yet taking in DHA independently from other food sources. After weaning, requirements return to the general adult level (250 mg EPA+DHA daily as the baseline recommendation).
Frequently asked questions
Do I need to take omega-3 supplements while breastfeeding?
If you eat two portions of oily sea fish per week, you can largely meet the DHA requirements of breastfeeding through diet and may not need a separate supplement. Those who eat little or no fish, or follow a vegetarian or vegan diet, should consider DHA supplementation (fish oil or algae oil) and discuss this with their doctor.
How much DHA do I need daily as a breastfeeding mother?
EFSA recommends 200 mg DHA daily in addition to the general baseline of 250 mg EPA+DHA — i.e. a total of at least 450–600 mg daily. The same recommendation applies internationally (WHO/FAO, ISSFAL). These amounts correspond roughly to one to two portions of oily sea fish per week or a daily DHA supplement.
Will the DHA content of my breast milk change if I take omega-3?
Yes. Studies consistently show that DHA content in breast milk increases when the mother takes in more DHA through food or supplements. The response is dose-dependent and occurs within a few weeks of starting increased DHA intake. This is one of the best-documented links between maternal diet and breast milk composition.
Is algae oil safe during breastfeeding?
Yes. Algae oil is derived directly from marine algae, contains no mercury and is free of fish antigens. It is suitable for vegans and delivers DHA with good bioavailability. Studies show comparable effects on maternal DHA status to fish oil. In recommended dosages, algae oil is considered safe during breastfeeding.
Will my baby get enough DHA if I breastfeed?
This depends on the DHA content of your breast milk — which in turn depends on your diet. If you regularly eat oily fish or take a tested DHA supplement, your breast milk will generally be well supplied with DHA. With a vegan diet without DHA supplementation, the DHA content of breast milk may be significantly lower. If in doubt, discuss your DHA status with your doctor.
Medical disclaimer
This article is for general information purposes only and does not replace medical advice. All health statements are based on EFSA-approved health claims and published scientific studies. Dietary supplements during breastfeeding should only be taken after consultation with a doctor. The dosage recommendations in this article refer to the current state of scientific guidelines; individual needs may differ. Dietary supplements are not a substitute for a balanced and varied diet.
Related articles: Omega-3 during pregnancy · Omega-3 and fertility · Omega-3 and the brain