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Hi. Welcome to Just Answer. My name is***** Thank you for taking care of this little one! It sounds like he's very lucky to have found you. Lose stools like this can be dietary related. Sometimes the formula that is being fed can cause lose stools. If he's around 5 weeks old, then getting him weaned to eating kitten food may help a lot with this. Making a gruel of the kitten food can be done and then letting him walk in it to get it everywhere and then he can lick it off and figure out that it is good tasting food. The transition to the kitten food may help to get more fiber and such into the diet to help with this. Ideally a stool sample should be checked by a vet to see if there are intestinal parasites / coccidia / giardia at hand that need specifically treated. As far as keeping the rear end clean, it needs to be done to prevent it from being constantly moist as this can set up dermatitis issues.