Here is the longer version... (sorry if this is more than you were asking for)
DS started showing some digestive difficulties around 6 weeks. Over the next 3 weeks, I strictly eliminated milk, soy, peanuts, and wheat from my breastmilk. I would not even consume anything manufactored in facilities where things were made with these items. Despite my best efforts, DS remained allergic to something. After giving him the chance to get used to the "free" milk and heal, his little system was still reacting to something. He continued to show symptoms of moderate colitis. Essentially, his little colon was raw and bleeding. We regularly tested his stools for blood. By the end, we could actually see the blood.
At 8 weeks, we tried to suppliment with Nutramagen and the problem continued. At 9 weeks, we switched him to Neocate (amino acid formula) and held off on the BM to see what happened. Quickly his mood improved. A short time thereafter, his stools tested negative for blood.
I gave up the restrictive diet as the holidays approached. I had plenty of "free" milk in the freezer and kept my milk active in hopes of his system maturing and being able to tolerate my milk. I reintroduced the "free" milk around 4mo. I gave him 2oz a day for 6 days and was able to notice a change in his behavior.
At that point, I resigned that my LO has a super sensitive system and stopped pumping.