Paeds · allergy-and-immunology
Cow's-milk protein allergy
Also known as Cow's milk allergy · CMPA · Cow's-milk protein hypersensitivity · Bovine protein allergy
A fellowship approach to cow's-milk protein allergy (CMPA): separate the immediate IgE-mediated phenotype from the delayed non-IgE-mediated phenotype, clear the anaphylaxis threat gate first, confirm the diagnosis clinically by elimination and planned rechallenge rather than over-relying on allergy tests, and run the stepwise elimination ladder — maternal elimination for the breastfed infant, extensively hydrolysed formula first-line for the formula-fed, amino-acid formula for severe or refractory disease — while building tolerance over time.
On this page
Study tools
Your progress
Saved on this device.
Practise this topic
Target exams
Red flags
- Acute onset urticaria, angioedema, stridor, wheeze, hypotension or collapse within minutes to two hours of cow's-milk exposure — treat as anaphylaxis
- Vomiting that progresses to lethargy, pallor or floppiness after milk — possible food-protein-induced enterocolitis syndrome (FPIES)
- Persistent or worsening faltering growth alongside gastrointestinal symptoms and eczema
- Blood and mucus in stools of a well-looking breastfed infant — cow's-milk protein-induced proctocolitis
- Recurrent vomiting, dysphagia or food impaction — consider eosinophilic oesophagitis
- Severe widespread eczema from early infancy that fails standard therapy
- Any reaction with respiratory compromise after ingesting a new infant formula
Life stages
Care settings
Clinical exam formats
Board mappings
- General and Community Paediatrics
- Infectious Diseases, Immunology and Allergy
- Gastroenterology
- Allergy and immunology — recognise, investigate and manage food allergy
- Gastroenterology — manage common presentations including food-related gastrointestinal disease
- Renewed curriculum for first-year trainees from 2027 — Learning goal 6: Clinical management – essential general paediatrics
- Immunology and Allergy 10-12
- Clinical Applications
- Medical Sciences
- Long Cases
- Short Cases
- 9. Infection, Immunology and Allergy
- 4. Professional skills and knowledge: Patient management
- 7. Patient safety, including safe prescribing
- Foundation of Practice (FOP)
- Theory and Science (TAS)
- Applied Knowledge in Practice (AKP)
- Clinical
- History
- Communication
- Video
- General Pediatrics Content Outline - D17 Allergy and Immunology (3%)
- General Pediatrics Content Outline - D13 Gastroenterology (5%)
- General Pediatrics Content Outline - Universal Task 4: Management and Treatment
- Patient Care 4: Clinical Reasoning
- Patient Care 5: Patient Management
- Medical Knowledge 3: Allergy and Immunology
- Systems-Based Practice 1: Patient Safety
- Medical Expert
- Pediatrics: Foundations EPA #8 - Communicating assessment findings and management plans to patients and/or families
- Pediatrics: Allergy and Clinical Immunology (0-5%)
A four-month-old arrives with blood and mucus in the stools but looks well and is growing. Beside her is a six-month-old who turned red, vomited, and became wheezy ten minutes after a first bottle of formula. Both have cow's-milk protein allergy, but they are different diseases with different risks, different diagnostic logic, and different pathways. Holding both in the same frame — the calm delayed gut phenotype alongside the immediate anaphylaxis phenotype — is the whole skill of this topic. [1] [3]
Mucosal vs immediate onset · IgE or non-IgE phenotype · Look for anaphylaxis first · Keep breastfeeding with maternal elimination · An extensively hydrolysed formula first-line · Lactose is usually tolerated · Long-term: most resolve by age 3-5 · Eliminate then rechallenge to confirm · Reassess tolerance annually · Goat and sheep milk cross-react · Yes to calcium and vitamin D supplementation. [1] [2]
Overview & Definition
Cow's-milk protein allergy is an adverse immunological reaction to one or more of the proteins in cow's milk — most often casein and the whey proteins beta-lactoglobulin and alpha-lactalbumin. It is the commonest food allergy of infancy. The key clinical division is between IgE-mediated disease, driven by specific immunoglobulin E against milk proteins and manifesting within minutes to two hours of exposure, and non-IgE-mediated disease, driven by cellular and mixed immune mechanisms and manifesting hours to days after exposure. [1] [3]
Do not confuse CMPA with lactose intolerance, which is an enzyme deficiency (lactase) producing bloating and diarrhoea without any immune mechanism. The two are commonly conflated by families and occasionally by clinicians, and the distinction matters because lactose intolerance is not dangerous and does not need elimination of all cow's-milk protein. The vast majority of infants with CMPA tolerate lactose without issue. [2]
The decisive clinical question at first contact is never "is the skin-prick positive?" but "which phenotype is this, and could this become anaphylaxis?" A positive test in an asymptomatic child is sensitisation, not allergy. A child who reacts on exposure is allergic regardless of the test number. The ESPGHAN practical guideline makes this point explicitly: CMPA is a clinical diagnosis confirmed by elimination and rechallenge, with tests used to phenotype rather than to screen. [1]
References12ShowHide
- [1]Koletzko S Diagnostic approach and management of cow's-milk protein allergy in infants and children: ESPGHAN GI Committee practical guidelines. Journal of pediatric gastroenterology and nutrition, 2012.PMID 22569527
- [2]Luyt D BSACI guideline for the diagnosis and management of cow's milk allergy. Clinical and experimental allergy, 2014.PMID 24588904
- [3]Fiocchi A Diagnosis and Rationale for Action Against Cow's Milk Allergy (DRACMA): a summary report. The Journal of allergy and clinical immunology, 2010.PMID 21134569
- [4]Skripak JM The natural history of IgE-mediated cow's milk allergy. The Journal of allergy and clinical immunology, 2007.PMID 17935766
- [5]Liu AH National prevalence and risk factors for food allergy and relationship to asthma: results from the National Health and Nutrition Examination Survey 2005-2006. The Journal of allergy and clinical immunology, 2010.PMID 20920770
- [6]Nwaru BI Prevalence of common food allergies in Europe: a systematic review and meta-analysis. Allergy, 2014.PMID 24816523
- [7]Muraro A EAACI food allergy and anaphylaxis guidelines: diagnosis and management of food allergy. Allergy, 2014.PMID 24909706
- [8]Greer FR 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.PMID 30886111
- [9]Leonard SA Baked Milk and Egg Diets for Milk and Egg Allergy Management. Immunology and allergy clinics of North America, 2016.PMID 26617232
- [10]Leonard SA Baked Egg and Milk Exposure as Immunotherapy in Food Allergy. Current allergy and asthma reports, 2016.PMID 27002516
- [11]Fiocchi A The global impact of the DRACMA guidelines cow's milk allergy clinical practice. The World Allergy Organization journal, 2018.PMID 29308116
- [12]Vandenplas Y The Remaining Challenge to Diagnose and Manage Cow's Milk Allergy: An Opinion Paper to Discuss Daily Practice Challenges. Nutrients, 2023.PMID 38004156