My 2 year old is allergic to soy and cow's milk. I breast fed for most of the first year and just cut them out of my diet (a great way to lose weight, by the way) But, since my breasts don't pump well, I introduced a bottle of alimentum fairly early on. It is expensive and nasty smelling. I would never have tried it myself. I believe it's made with corn protein. Oh, the thought is terrible. That being said, we never experienced anything but good results from it. He liked it a lot and he never had any reactions, tummy problems, etc. from it. I have never heard if the other one. Maybe I can learn from the other answers. I just had another baby 2 weeks ago and as of now, we don't know of any allergies. I'm breastfeeding again and to be proactive, I just cut those 2 things out of my diet. Maybe the nutramigen is less expensive? Anyone know what it's made from? Good luck K.. By the way, I bought mine at Publix. It's probably best to buy it at Walmart, if they carry it. Most everything they sell there is MUCH less expensive.