Is there any reason that an exclusively breastfed baby would have bright green poop? My daughter is six months, and has never had anything else. She is a little sick, I don't know whether to call it a bad cold or a mild flu. But the green poop started a little before that, close to two weeks ago, now. I figured it was something I ate, but I just can't figure out what. I've tried eliminating all sorts of things from my diet.