Ahhh the question rears its ugly head again! Next to politics and religion, CD comes a close third of what should not be discussed in mixed complany. I used cloth diapers on the little guy when he was NB but we switched later. I see a few issues that some folks have brought up already but the only one I can really stand behind for not using them at WDW is sanitary reasons. I personally think washing poopy diapers in public washing machine is inconsiderant to the folks that are going to use it after you. If your little one has a firm BM its not quite so gross but if they have a case of the runs thats a whole other ball game. I know I know bleach and hot water kill all the nastys and things far worse than poopy diapers end up in public laundry units but I just think its a little disrepectful to the folks that go after you, thats all. Just my 2 cents Either way enjoy the trip!