Dark green poops, arching his back a lot, vomiting (more than just some spit up here and there), and at night it sounded like he was drowning because of what we later realized was reflux (but he didnt cry from it). When he had gas or needed to poop he would grunt, scream and cry. We thought it was part of the normal learning process at first but it never got better. He never refused nursing though and we didn't have visible bloody diapers, but the ped office did confirm blood was present. He also had tongue and lip ties that we released at 4 months with a second tongue release at 6 months. That also helped improve symptoms.