Can you suddenly be allergic to a brand of milk powder that you have been drinking since birth?

Patient's question:

A two-month-old baby has been drinking the same brand of formula since birth. Recently, there has been redness on one side of their cheek and chin again. Could this be a milk allergy?
A two-month-old baby has been drinking the same brand of formula since birth. However, recently they noticed slight redness on their face and chin, which has subsided somewhat. Is this an allergy? What harm could it cause? Can they still get vaccinated? Polio vaccine?

Doctor's answer:

A two-month-old baby has been drinking the same brand of formula since birth. Recently, there has been redness on one side of the cheek and chin, which seems to be a possible allergy. It is necessary to make an assumption whether it is a formula allergy.
Medical advice: If the baby is still eating the same brand of formula, check if the current formula is newly purchased or if it was started recently. If it is, it could be related to the formula. If it has been eaten for a while and the formula has not spoiled, it may be unrelated to the formula. In that case, it would be necessary to investigate what the baby has come into contact with. Mild allergies usually improve quickly with treatment, and severe allergies are rare. Babies with allergies should not receive vaccinations.

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