Can't help you, but I sympathize. My baby was a green pooper for about a month. I also ruled out teh imbalance, and sickness. Still have no idea what it was. But, she was healthy, and is fine now. I decided it was just an individual difference. the only possibility is that my daughter was quite jaundiced unit a month old, and the green poop went away when the yellowish tinge did. Is your baby jaundiced?