I am also nursing a 2.5 year old, 2-3 times a day and I just did a cleanse. It was a mild, 7 day cleanse, and I've never done one before. I kind of figured that if there are toxins in me, they are all ready getting into the milk, and while detoxing will release more into the milk, the end result should be less on a daily basis. Like pp mentioned, I felt like I needed it to get me on track to eating "cleaner" and I am also trying to shed some weight so need to rethink my food choices...I found it amazing, I feel great. DD did get a couple pimples, which has never happened before, and so it may have had some effect on her system, but so should all the detoxifying herbs and such, so I don't know...perhaps it was reckless, but I felt i needed to do it, and I'm REALLY glad that I did....
Don't know if that info helps....I am going to stick to the simple eating plan the cleanse suggested, it feels so liberating to eat less and feel great!