It's possible to be allergic to soy, I don't think vitasoy is good for babies though, doesn't it have sugar and other stuff? You can give sugar free natural soy milk again in a few days and see if the symptoms return.
Ah I see, if it's a very small amount it's unlikely to cause allergic reaction plus the rash would appear in less than an hour. I think you can still try giving soy milk in very small quantity and see if symptom returns, keep Zyrtec on stand by if you have.
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