One other note: We saw a lactation consultant for another problem, but one of the things she told us was that lots of babies have an aversion to cow's milk (if the mom drinks too much), which can cause the green poop. So I went off dairy a couple of weeks ago and for a while was seeing a big difference. The green poop has made its return lately, but I think it's because I haven't been eating enough fiber (for some reason the poop tends to be green when my LO is constipated...).