Hi, Melissa, It is normal for some of the stomach fluids to back up into the tube- tho there shouldn't be alot. Does your hubby have the tube cap taped up higher on his chest that where the incision is? If his stomach is full and he is lying down, sometimes just rolling onto one side or the other will shift some of the fluids into the tube. He also might be putting too much into the tube at a feeding and getting too full. Remember all the water you are flushing with has to be absorbed too. It takes some getting used too. Don't panic- just keep experimenting and ask the Doc the next time you see him\her. Amy in the Ozarks