Multiple Food Allergies

Is it common to have multiple food allergies as opposed to just one? My son's peanut allergy is definitely the scariest. When we first went to the allergist with him (he was somewhere between 6 mos. to one year old), we were surprised to find the multiple food allergies he had. In addition to the "dreaded" peanut, he also has milk and egg allergies. For years he drank soy milk, but has since then outgrown his milk allergy; he loves drinking chocolate milk. He still has a slight allergy to eggs; he can't eat them straight, but can if they are mixed in and "dilluted" with other ingredients - example: cakes and cookies. His "food" life definitely improved with his ability to drink milk and "somewhat" eat eggs. The peanut is still the biggest concern. With the news of treatments that I shared yesterday, there is hope though.