Common allergy-causing foods (allergens) should be introduced to your baby alongside other solids once your baby is interested in food. This is usually from 4–6 months old. All the common allergens should be introduced by 12 months of age. These foods are:
Well-cooked egg and peanut in the form of a spread or paste should be introduced early. Studies show this can decrease the chance of developing allergies. Once introduced, these foods should stay in your child's diet.
Rubbing or smearing food on your baby's skin cannot help diagnose allergies and may increase the risk of your baby becoming allergic to that food.
Seek acute medical attention if required. Note what symptoms your baby had, the duration of symptoms, and the timing between eating the food and symptoms. Avoid the food and see your GP. They may consider a referral to a paediatric allergist. The only way to know if your baby is allergic or not is for them to eat the food, so continue to introduce other allergens.
More information about introducing allergens to your baby can be found at preventallergies.org.au