3. Soy
Although they’re part of the legume family, allergies to soybean deserve their own section since they’re quite frequent. Under 1 percent of children are allergic to soy, but that’s enough to make it advisable for parents to withhold introducing soy to their infants so their organisms can better fight off an eventual reaction. The good news is that research indicates most kids allergic to soy outgrow the allergy by the time they become teenagers.