What changes should I expect in my baby’s poop or GI system when taking Evivo? Yes, baby poop comes in all shapes and forms. Not all babies need changes in their poop to show that Evivo is working. If your baby is receiving Evivo + breast milk each day, then Evivo is working. In our study, we found that some babies taking Evivo saw a reduction in the number of poops. All babies are different, and some babies can go numerous days without pooping. If you have any concerns it is always best to consult with your pediatrician.