Allergies aren't inherited, so try not to worry that your child will be allergic to a food just because you happen to be allergic to it. In terms of trying out a food that people are often allergic to, start by rubbing a small amount of the child's skin. Wait 20-30 minutes to see if they have any kind of reaction. If they don't, try rubbing a little bit on their lips without letting them eat it and wait another 20-30 minutes. If their lips don't swell and there's no other evidence that they're allergic, try feeding them a little bit. You can typically start this process when a child is 6 months old.