Will My Child Outgrow Their Allergies? Reviewed by Dan Brennan, MD on May 05, 2019 It depends on what they are allergic to. Most kids don’t outgrow seasonal allergies, or hay fever. But some do outgrow food allergies to milk, eggs, or soy. A lower number -- about 20% -- outgrows a peanut allergy. Talk to your doctor about it.