Maxton has developed a pretty nasty case of exczema on his face (and a bit on his stomach/chest) over the last month. He had his 4 month appt today and the dr recommended switching to soy based formula and gave me a sample case of similac soy. I've given him two bottles already - the smell is making me a bit sick. Haha. Anyways, just wondering if anyone has experience with soy formula? Anything I should be looking for as far as negative reactions? And how long will it take before I know its working?