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First, you will want to consider that it will not be easy to remove milk, egg and peanut from your diet although many of us who have food allergic children have removed those foods and more! You'll fit into your skinny jeans by summer! The next point is that soy is one of the eight major allergens, (milk, wheat, egg, soy, peanut, tree nuts, fish, shellfish) and it is not uncommon for a child who is allergic to milk to also be allergic to soy. Here is a link to a journal abstract, and as you can see from the quote, 12 of the 18 milk allergic infants were not able to tolerate soy formula.  Comparisons of a chicken-based formula with soy-based formula in infants with cow milk allergy."RESULTS: In the group of soy-based formula, 12 out of 18 infants had evidence of intolerance and could not continue with the formula. However, only 4 out of 20 infants in the chicken-based formula group had evidence of clinical intolerance."It's common to think of soy as a health food but there is a lot of information that contradicts that as well. You may also be interested in the abstract below. It mentions that breast feeding while introducing new foods may help the baby tolerate them:The importance of early complementary feeding in the development of oral tolerance: Concerns and controversies.  "There is also evidence that other factors such as favourable colonization and continued breastfeeding promote tolerance and have protective effects during this period when complementary feeding is initiated."I think the most important factor to consider is whether you are prepared to go on a restricted diet and continue to breast feed.  If you find that this is not the right choice for you, there are other formulas you can use even if your baby cannot tolerate soy. (Neocate and EleCare are two amino acidHope that helps! Gina