My kitten is 6 weeks old and his fecal culture came back negative for parasites/worms. They gave him the deworming pill anyways but he's still having diarrhea. He's eating and drinking and playing normally but we have to clean his bum every time he poops cause it gets all over his bum with the litter. How can i fix this? Should i be feeding him something else? I use wellness brand wet food and i just bought kitten formula for him. I also put a little pedialyte in his water. Is there any other things that might help faster than others?