Parents trying to navigate the confusing world of children's food allergies now have more specific advice to consider. Highly allergenic foods such as peanut butter, fish and eggs can be introduced to babies between 4 and 6 months and may even play a role in preventing food allergies from developing.

These recommendations regarding children and food allergies—a rising phenomenon that researchers don't fully understand—come from the American Academy of Allergy, Asthma & Immunology in a January article in the Journal of...