Kittens can vomit for various reasons, from infectious diseases such as panleukopenia to intestinal parasites (roundworms/hookworms), intestinal foreign bodies, and more. Kittens require more frequent feedings and can dehydrate more rapidly than a healthy adult cat. Thus, if you have a young kitten vomiting, seek veterinary care ASAP. Kittens can vomit for various reasons, from infectious diseases such as panleukopenia to intestinal parasites (roundworms/hookworms), intestinal foreign bodies, and more. Kittens require more frequent feedings and can dehydrate more rapidly than a healthy adult cat. Thus, if you have a young kitten vomiting, seek veterinary care ASAP.