Our allergy story is long and intense, but, yes, ds2 reacted strongly through breastmilk, starting at 2 months (directly after his 2-mos vaxes
Won't be doing those again). He stopped growing for five months and was completely torn up, head to toe, with the worst eczema any of his drs. had ever seen. His first peds. didn't want to refer us to specialists, took it personally when we pursued specialists on our own and, when we switched peds, reported us to CPS. That was fun. (for the record, CPS was great; just followed up with our other drs. for a couple months and even said our old ped. had a god complex. It was still the most frightening experience of my life.)
To make a very long story as short as possible, ds2 was ultimately found to be allergic to dairy (now ana to dairy, even on contact), soy, eggs, nuts, peanuts, corn, wheat, mustard, buckwheat, banana and avocado and most of the latex spectrum. I've been on the same diet for nearly two years now. We assumed a latex allergy b/c of his severe reactions to banana and avocado and it was recently confirmed as a high positive. Banana and avocado have been pretty easy to avoid; the related fruits have proven to be a little limiting, but not impossible. (beware of "natural fruit flavorings", esp in meds) I would err on the side of caution, as we did, and assume a latex allergy. We have noticed, even though we've made sure that everyone touching him uses latex-free equipment, that every time we're at the drs'/hospital his eyes become red and swollen and he frequently leaves with a rash. Someone on POFAK (great group) suggested sticking with morning appts. By afternoon, the latex powder is lingering on clothes and hands and in the air.