I had to do it while nursing my son, he was very sensitive to dairy (projectile vomitted), and tomoatoes (very gases), and I did go to a lactation consultant and was doing everything right. Some babies are just sensitive. My son still has allergies and now asthma. But it was all very worth it. I just thought if I stopped nursing and switched to formula we would still have problems, and I would have ended up putting him on the most expensive formula out there. And as an added bonus for a very restrictive diet, I lost even more weight than I have ever been able to lose. I really think I need to take dairy out of my diet now and I would be able to lose that last 10 lbs. My child was so bad a first, I had to try the diet I think I found on Dr. Sears website, that was down to eatting organic chicken, stemmed squash, and stemmed pears and that was it, and then add foods back one at a time. I also heard that some babies can't tolerate raw fruits and veggies, so keep that in mind, and I found a very yummy vanilla flavored rice milk (Rice Dream I think it is called) that quenched my thirst for milk. Just hang in there you can do it!!! Oh, and I was able to nurse my son for the first year!!!