what kind of formula? that happened to my son sometimes with Similac. his doctor said it was normal but I would still call your doctor and see.

He's bottle fed though. @askarova2524

If you're exclusively breastfeeding green poops are ok, as my pediatrician said. Also could be baby got too much foremilk and not enough hindmilk. Hope it's helpful. If it's green and has mucous then it's allergy on smth you ate. My daughter had that a few times