I noticed mine had loose stools when I stressed them out, say when I moved them or had to clean their box... Make sure you are following the directions to a T and giving them the right amount of medicine in their water. You may want to even decrease it a little bit. Personally, I didn't give my birds anything, I bought some antibiotics, but ever used them. My birds were ten days old when I got them and I haven't lost a single one.. They are 4 weeks now and growing like crazy.