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Thank you for your response! He doesn't even want to eat the full 1/2 a cup most days. He eats close to it. I don't think he is hungery. Yes, the vet thinks he is very healthySome cats are just on the smaller side. My first concern would be is he eating enough. Half a cup of Iams dry kitten should be about 250 calories which should be good for a kitten. If he is eating all his food everyday and meowing for more, I would give him maybe a tablespoon more a day (not a lot but that is fairly calorie dense food so a little goes a long way) and monitor him. Just to make sure it isn’t a calorie issue, I don’t think it is but doesn’t hurt to overfed kittens.
Assuming his vet checks are good, then it just becomes a “he is small” commentary. My girl is small too, her weight usually fluctuates between 7 and 7.5 pounds but at a year old she was just over 6 pounds (the extra pound is all muscle). Here she is near my boy who was 12 pounds in this photo (but is now 14 pounds, which is pushing healthy weight for him).
Adult size for you I would guess to be probably 7-9 pound range, probably 8ish. Which is on the smaller side for a male but not unheard of. He will probably finish growing in height and length around a year old and continue to add on muscle and fill out some until two years old. I’d switch him to an adult food at probably one year old just to give him the kitten nutrition profile until then but switch to adult so he doesn’t get chubby.
