If I never give the allergen, will the allergy become permanent?

No, the opposite happens. Removing a food completely from your baby's diet actually reduces their chances of developing tolerance to it. Current pediatric evidence shows that most childhood food allergies (especially cow's milk, eggs, wheat) naturally resolve over time — but this resolution requires your baby's immune system to be regularly and safely exposed to the food. Permanent avoidance lowers the odds of the allergy going away. That's why the right approach isn't to ban a food forever on your own, but to see a pediatric allergist. The specialist will confirm the diagnosis through testing and, if appropriate, do supervised "food challenges" in a hospital setting to see if your child can actually tolerate the food. After you have professional evaluation, your allergist may guide you toward gradual reintroduction rather than lifelong avoidance. In short: don't permanently cut a food out without expert evaluation — that often creates unnecessary restriction and delays the allergy from resolving. Get a professional assessment first.