Table of Contents

Milk Allergy in Infants: Symptoms, Diagnosis, and Treatment

Key Takeaways: Milk Allergy in Infants

Milk allergy in babies is an immune reaction to cow’s milk protein, different from lactose intolerance.
Symptoms include rash, vomiting, diarrhoea, wheezing, and poor feeding.
Anaphylaxis is rare but life-threatening—seek urgent help if breathing is affected.
Diagnosis requires medical testing such as skin prick, blood tests, or food challenges.
Management involves avoiding cow’s milk proteins and using safe formula or diet alternatives.
Many children outgrow CMA by ages 3–5, but regular monitoring is essential.
Parents should create an allergy action plan with their doctor and inform caregivers.

What Is Milk Allergy in Infants?

Milk allergy in infants occurs when the immune system reacts abnormally to proteins found in cow’s milk, leading to a range of allergic symptoms. This is distinct from milk intolerance, which is digestive in nature and does not involve the immune system.

Definition of Cow’s Milk Allergy (CMA)

Cow’s Milk Allergy (CMA) is an immune system response to proteins in cow’s milk. There are two types:

IgE-mediated CMA: Immediate symptoms occur, typically within minutes of consuming milk.
Non-IgE-mediated CMA: Symptoms appear hours or even days later.

CMA vs. Lactose Intolerance

CMA involves immune reactions and can cause skin, respiratory, and digestive symptoms such as rashes, vomiting, and wheezing.
Lactose intolerance is caused by difficulty digesting lactose (milk sugar), leading to bloating and diarrhea but no immune response.

Common Symptoms of Milk Allergy in Infants

Skin Symptoms

Hives or welts
Swelling of the lips, eyes, or face
Eczema flare-ups
Redness and rash

Digestive Symptoms

Vomiting after feeding
Diarrhoea, sometimes with blood or mucus
Poor weight gain or excessive crying
Refusal to feed

Respiratory Symptoms

Wheezing or coughing
Nasal congestion
Difficulty breathing—urgent medical attention required if this occurs

Severe Allergic Reactions and Anaphylaxis

Anaphylaxis is a rare, life-threatening reaction. Signs include:

Sudden limpness or floppiness
Difficulty breathing
Swelling of the tongue, lips, or throat
Pale or blue-tinged skin
Unresponsiveness

Emergency Response Steps:

Call 000 immediately.
Administer adrenaline if prescribed.
Lay the baby flat and do not hold upright.
Seek urgent hospital care.

Diagnosis: How Is a Milk Allergy Confirmed?

Role of Paediatricians and Allergists

A paediatrician or allergist will:

Take a detailed medical history.
Assess feeding patterns and symptom onset.

Common Tests Used

Skin prick testing
Blood (IgE) tests
Oral food challenge (under medical supervision)
Elimination diets to observe symptom improvement

Managing Milk Allergy in Infants

Formula Substitutes for Allergic Infants

If your baby has CMA, your healthcare provider may recommend:

Extensively hydrolysed formula (EHF) – Milk proteins are broken into smaller pieces.
Amino acid-based formula (AAF) – Suitable for severe allergies.
Soy formula – For babies over 6 months, as advised by a doctor.

Additionally, food safety during the preparation and handling of these formulas is paramount. Always ensure that feeding bottles and formula containers are thoroughly cleaned and sterilised to prevent contamination and safeguard your baby’s health.

Breastfeeding Tips for Allergic Babies

Mothers may need to eliminate dairy and cow’s milk products from their diet while breastfeeding. It’s important to handle food carefully to avoid cross-contact with milk proteins.

Avoiding Milk Proteins in Solids

Be cautious during weaning and avoid hidden milk ingredients such as casein, whey, or lactose.
Always read food labels carefully.

Outlook and Prognosis: Can Infants Outgrow Milk Allergy?

Most children outgrow CMA by ages 3 to 5, particularly non-IgE types. Regular monitoring with your child’s doctor is essential to assess tolerance and guide safe food introduction. Caregivers should also be trained in food safety.

FAQs

What are the first signs of a milk allergy in infants?

Symptoms like hives, vomiting, swelling, or wheezing usually appear soon after consuming milk.

Can a milk allergy cause skin rashes or eczema?

Yes, CMA can trigger rashes, hives, and eczema flare-ups.

How do I know if my baby has lactose intolerance or a milk allergy?

Milk allergy involves immune reactions (e.g., rash, swelling, breathing issues), while lactose intolerance causes bloating and diarrhea without immune responses.