Cow’s milk allergy typically develops in a baby’s first year, and it occurs when the immune system reacts inappropriately to a protein in cow’s milk2. The protein could be in infant formula, or in breast milk from whatever mum is eating.
The allergic reaction usually causes symptoms like diarrhoea, wheezing and eczema. Cow’s milk allergy can be distressing for babies and their families, because it’s not always easy to spot. These symptoms are common in infants who aren’t well, so it can take time to diagnose.