My son has a peanut allergy. He was deemed very severe. He started treatment daily peanut doses. Starting at 5 mg. He is now eating 4 peanuts a day and counting. Zero issues with exposure now. If you have a kid with a peanut allergy find an allergist who will desensitize them.see https://www.palforzia.com/
Do be careful, though. My nephew (now 4 years old) has/had several food allergies. Some he's ok with now, but for some the desensitizing process resulted in several ER visits.
The immunologist’s office weighs these tiny amounts and sends you home with a few weeks’ supply. As you progress and the margin of error becomes less dangerous, you get to weigh it yourself.