He's been on formula since he was about 5 days old, and he's 9w old today. So from what I can tell from what you guys have said, he perhaps does have a bug, or it's an immature digestive system, or its the formula?!? Eeeeks...so many possibilities LOL. I may even ring the CHN on Friday and see what they say (it's a public holiday here tomorrow). I trust the Doctor, but I wouldn't mind talking to someone else about it too IYKWIM......I've just been getting myself worked up into a frenzy thinking there's something horribly wrong with my baby!! The thought of it just makes me shudder!! I really appreciate your thoughts guys.... it's good to hear that I'm not the only Mummy whose had a baby with green poos LOL.