The big 8
According to the Food and Drug Administration, these foods tend to cause the most trouble. (In fact, they account for about 90 percent of food allergic reactions.)

1.  Milk
2.  Eggs
3.  Fish (bass, flounder, cod)
4.  Crustacean shellfish (crab, lobster, shrimp)
5.  Tree nuts (almonds, walnuts, pecans, hazelnuts)
6.  Peanuts
7.  Wheat
8.  Soybeans

The key symptoms
Reactions usually occur shortly after consumption, so monitor your child closely after meals— especially if you introduced a new food.

Skin problems
• Hives
• Itchy rashes
• Swelling

Breathing problems
• Sneezing
• Wheezing
• Throat tightness

Stomach problems
• Nausea
• Vomiting
• Diarrhea

Circulation problems
• Pale skin
• Light-headedness
• Loss of consciousness