Cows' Milk Protein Allergy: Recognising the Signs in Babies

Some babies struggle with feeding in ways that are not explained by simple reflux or colic. Cows milk protein allergy can be one cause; and I have created this video to help you recognise it, and find support quickly if needed. Cows milk protein allergy happens when your baby's immune system, reacts to one of the proteins in cow's milk. It affects around two in every hundred babies; and most outgrow the allergy by around age five. Recognising this allergy early can help your baby feel more comfortable; and reduces avoidable distress. There are two main types of cows' milk allergy and they tend to behave very differently. One causes rapid symptoms within minutes or hours; while the other develops more slowly over hours, or days. The first type, called IgE-mediated allergy, produces symptoms within minutes or up to two hours after a feed. Your baby may develop a rash; swelling around the lips or face; vomiting; or occasionally wheezing. Severe reactions are rare but serious; and they need emergency medical attention without any delay. The second type, called non-IgE allergy, is more common in babies and develops gradually over a few hours to two days. Signs may include reflux; diarrhoea; constipation; blood, or mucus in the stool; eczema; or persistent irritability around feeding times. Because many of these signs are also common in babies without an allergy - the diagnosis is not always obvious. This is one area where a careful clinical history and physical examination really help. It is also important not to confuse cows' milk allergy with lactose intolerance - which is something very different. True lactose intolerance is rare in babies, and many lactose-free products still contain cows' milk protein and would not help. Diagnosis usually involves a careful history, and a trial of strictly removing cows' milk protein from your baby's diet for two to four weeks. If symptoms improve and then return when milk is reintroduced, a non-IgE allergy is likely. This trial should also be supervised by a clinician, to keep your baby's nutrition safe. If your baby is formula-fed, your clinician may recommend a special prescription formula called: an "extensively hydrolysed formula". If you are breastfeeding, you can usually continue - while removing dairy from your own diet for the trial period. Most babies grow out of cows' milk allergy, often well before they start school. The outlook for most children is reassuring, and dairy can usually be reintroduced gradually and under guidance. Some warning signs always need an emergency response, even though they are uncommon. Call 999 immediately for: difficulty breathing, severe swelling of the face or tongue, or a baby who becomes pale, floppy, or unresponsive. If you suspect your baby has cows milk protein allergy - please do not feel you have to work through it alone. A paediatric review can clarify the diagnosis; plan a safe elimination trial; and offer support throughout the process. As a consultant paediatrician, I take time to listen to feeding histories and review symptoms carefully; so that together we can plan a clear way forward that suits your baby and family. Please contact my team anytime if you have further questions about your baby's symptoms; or feeding.