I have a question for those of you who are allergic to milk and other foods
(or have children who are allergic).  I've seen many posts from mother's who
list numerous foods that their children are allergic to.  Because I am LI, I'm
a bit uneducated about  the allergy, so please excuse me, as I am trying to
learn about it.  My question is how do you know what foods are causing the
allergic reaction.   If your child is sick after a meal, how do you know which
food caused it?  Are there tests which pediatricians or allergists perform to
determine, for example, an allergy to nuts or shellfish?

TIA
Suzanne