Infant Food Allergies and Cow's Milk Protein Elimination Diets: On a 2026 Article Published in the Journal of Human Lactation

Infant Food Allergies and Cow's Milk Protein Elimination Diets

Food allergies in infants, particularly in those who are exclusively breastfed, are a recurring theme in consultations, with elimination diets often undertaken in cases of "internal reflux" or "colic" noticed by parents. Frequently faced with contradictory information and inadequate support, mothers are often recommended prolonged elimination diets (particularly cow's milk protein elimination diets) or, failing that, premature weaning in favor of "special allergy" formulas.

This article, written by a dietitian and IBCLC lactation consultant, examines recent research on protein transfer in breast milk and proposes an evidence-based approach to managing these allergies while preserving breastfeeding.

The author notes that cow's milk protein allergy (CMPA) in breastfed infants is rare (less than 3%, though this is likely underestimated) and that symptoms are poorly defined, allergy tests are of limited effectiveness, leading to significant overdiagnosis.

The two coexisting mechanisms (IgE-mediated and non-IgE-mediated) also present differently.

Current standard recommendations include eliminating cow's milk protein for several weeks, often with referral to "special infant formulas" in cases of difficulty.

Cow's milk protein elimination serves both a diagnostic and therapeutic function: if symptoms improve, this confirms that the eliminated food was the source of the symptoms.

Lactasource note: improvement could also be due to the maturation of the child's digestive system, better parental observation of and response to the child's needs over time, or simply the passage of time...

The author reviews the mechanisms of protein transfer in breast milk in order to refine recommendations regarding elimination diets.

Key Findings and Recommendations

1. Protein Transfer Dynamics

Recent (proteomic) analyses reveal that not all proteins pass into breast milk, and that those which are transferred do so with individual variation. Dietary proteins pass into breast milk following highly consistent time patterns:

Peak concentration: Protein fragments (cow's milk, peanut, gluten, egg) reach their peak concentration in breast milk between 1 and 2 hours after maternal ingestion.

Clearance: Proteins are generally cleared from breast milk within 6 to 8 hours.

Implication: This knowledge challenges traditional recommendations for prolonged (several-week) elimination and suggests more targeted, time-limited interventions.

From Silver and Paullin, JHL, 2026

2. Targeted Elimination Protocol

Duration: Once the triggering food is removed, the infant's symptoms generally begin to improve within 72 to 96 hours, with complete resolution within a few days to a few weeks depending on severity.

Strategy: If no change is observed after 3 to 5 days, the excluded food is likely not responsible, allowing families to resume their diet or test another allergen.

Risk: Prolonged elimination diets carry risks of maternal nutritional deficiencies, impact on milk quality, and psychological burden. They should only be considered as short-term interventions.

3. Comprehensive Assessment

Effective management requires a comprehensive assessment before any dietary change:

Infant factors: Gut microbiome, medical history, feeding patterns, and oral function (e.g., tongue-tie).

Maternal factors: Nutritional status, mental health (stress, eating disorders), and breastfeeding logistics (feeding sessions, storage).

4. The Role of the IBCLC and an Interdisciplinary Approach

The authors emphasize that IBCLC lactation consultants play a central role in protecting lactation and supporting maternal wellbeing during elimination periods, implementing the elimination diet, and adjusting it.

A coordinated approach involving pediatricians, allergists, dietitians, IBCLCs, and mental health professionals is promoted as essential to ensuring the child's safety and development.

Conclusion

The proposed approach favors targeted elimination protocols, based on the science of protein transfer, rather than broad and prolonged dietary restrictions.

However, this article raises the question of the IBCLC's role (when not a physician): is it really within the IBCLC's scope of practice to diagnose an allergy and implement an elimination diet?

This article resonates with our NDC-Possums trainings, where we discuss overmedicalization in the perinatal field, particularly elimination diets, which constitute dietary care and should only be offered by dietitians or physician nutritionists within a defined framework.

IBCLCs who recommend cow's milk protein elimination risk unbalancing mothers' diets over the long term, with potentially serious consequences and deficiencies: dairy products contain important micronutrients such as calcium and iodine.

But there is also a potential impact on mental health:

• because food contributes to an individual's overall wellbeing. Restrictive diets can trigger eating disorders in people with a history of them;

• because these diets add mental load to mothers;

• because they give mothers the impression of "poisoning their baby" with their milk. As a result, some mothers wean under the constraint and mental burden generated by these diets.

It is essential that mothers receive adequate information. In our practice, we observe that these eliminations are only very rarely useful. Our profession is to focus on breastfeeding.

Bibliography

• Silver TH, Paullin T. From the Field - Supporting Families as They Navigate Infant Food Allergies. J Hum Lact. 2026 Feb;42(1):63-68. doi: 10.1177/08903344251401908. Epub 2026 Feb 19. PMID: 41711302; PMCID: PMC13087152.

• Elise Armoiry. My Baby Moon blog article: Cow's milk protein (CMP) elimination diet for breastfeeding women in cases of suspected CMP allergy in infants: what does the research say?