1.   Most children outgrow their food allergies, but those with allergies to peanuts and tree nuts are the exception, doctors say.

2.   Other potentially allergenic foods that might be avoided by both the infant and nursing mother include fish and shellfish, soy milk, chocolate, strawberries and tree nuts.

3.   That is the problem faced by three million Americans who are allergic to peanuts, tree nuts or both.

4.   While children often outgrow allergies to milk, soy and eggs, allergic reactions to peanuts, tree nuts and shellfish tend to be lifelong.

5.   Nobody is sure why peanuts, a legume more related to soy than tree nuts, are so allergenic.