Egg allergy usually first appears when kids are very young. According to medical experts, the good news is that most kids outgrow an egg allergy by the time they're 5 years old. However, some do remain allergic beyond this age, too.
Medical experts explain that when a child is allergic to eggs (or any other food), his immune system reacts to proteins, usually found in the egg white. The body thinks these proteins are harmful invaders and the immune system releases chemicals like histamine to “fight off” the invader.
The release of such chemicals can cause symptoms such as wheezing, coughing, throat tightness, stomachache, vomiting and/or diarrhea, a drop in blood pressure, hives, red spots and/or itchy, watery, or swollen eyes. In extreme cases, egg allergies can cause a severe reaction called anaphylaxis, which may begin with some of the above symptoms but quickly worsens. If it's not treated, anaphylaxis can be life threatening.
If you are planning to introduce eggs to your baby, remember to start with the yolk. Once you have ruled out that he is not showing any allergic reactions to the yolk, experts recommend introducing the white after one year of age. If your child displays any symptoms of allergy to this food, consult his pediatrician.
Another point to remember: the viruses for the flu vaccine are often grown in chicken eggs. So if your child has an egg allergy and you are thinking of giving him the flu shot, always ask the doctor if it's a good idea.