Just getting a chance to read this thread and wanted to throw out there that my dd is extremely sensitive to milk and reacted very severely to the a medication I was taking that had lactose in it. Of course, as her doc pointed out to me, the reaction could have been to the medication itself and not to the lactose but I believe it was the lactose based on the fact that the symptoms she exhibited were exactly like a milk reaction. Also, she is taking a medication with lactose on a daily basis (only 1 small pill as opposed to the 8 pills daily I was taking) and has been showing low level symptoms every day since begining it nearly 7 months ago. It did not occur to me until recently to blame the lactose but now I am nearly positive she is reacting to the lactose. It is rare, apparently, but it is possible and if you have a babe with a significant sensitivity to milk I would not give her something with lactose. In my case, I believe it has undone my many months of gut healing work, kept my baby from moving forward toward outgrowing the intolerance, affected her growth, hearing, speech, etc.