A. This sounds pretty typical of a belly of worms. Your vet will be better able to assist you in helping identify the types of worms common for your specific area and in turn be able to best recommend the type of medication needed to treat them. It's pretty common in cats, especially young ones that haven't been treated before. Try checking stool to see anything that doesn't look normal (like specs, or worms themselves if the infestation is bad), or collecting a sample for your vet to analyze. This is something that will require treatment, while it is fairly routine, can cause more serious illness.
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