How to recognise an allergic reaction

How to recognise an allergic reaction

Allergic reactions usually occur quickly – within minutes (although they can take up to 2 hours). Other reactions to foods may be delayed.

Signs of a mild to moderate allergic reaction in babies to a food include:

Signs of a severe allergic reaction (anaphylaxis) in babies

A baby having a severe allergic reaction to a food may experience any one of the following:

Minor redness around the mouth is most often due to irritation and is not usually due to an allergic reaction to the food.


It is best to seek advice from your doctor as children can develop vomiting and skin rashes for other reasons that are not allergy related. It is important that babies are not avoiding a food unnecessarily as that may increase their risk of developing an allergy to that food.