During residency I was taught that aprox 50% of cow's milk allergic babies are going to be soy allergic therefore dont use soy for cow's allegic babies. Formula to use would be an elemental formula. I do have a cow's milk allergic BF patient who wont drink elemental formula. No suprise. Given informed consent mom is using Soy as a suppliment. The AAP does have a policy statement on use of Soy formula, I'll find the referece and post it. That I am aware of nucleic acids arent in soy formula. I belive the problem of soy with premies has to do with vitamin and mineral absorption. Dr Nancy, can you confirm this? -Rob