i found this on catfocused.com - you also may ask your vet, or maybe there are feeding guidelines on your bag of kitten food?
PS - I love big kitties - our oldest is 18 pounds & isn't fat- he is a BEAST.
Feeding Your Kittens
Kittens need a diet of high-energy food because they grow and develop quickly. You can find out the nutritional value of your kitten's food by contacting the pet food manufacturer, or by checking the label. By paying close attention to your kitten's nutrient intake, you have a better chance of raising a healthy and happy kitten.
Kitten Dietary Needs Protein: 35 to 50% protein Fat: 17 to 35% fat Energy:
* at two months: 175kcal/day * at three months: 260kcal/day * at six months: 280kcal/day
Unlike adult cats, kittens can be fed on demand, since they will stop eating once they're full. This method allows your young kitten to eat as much as she needs in order to grow into a healthy adult cat.
Cow's milk is generally not an appropriate food for kittens. Cats lack the proper enzymes to digest dairy products. Access to fresh water is what your kitten needs.
-- Edited by laken1 at 15:01, 2005-09-09
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I just wanted to add that while cows milk isn't the best thing for a cat places like Petsmart and Petco carry special milk that cats can digest. I've seen it in a refrigerator like thing at Petsmart on the food aisle.
My kitten eats like a madwoman too. I too was concerned at first, but then I noticed that she doesn't seem to be getting fat. She's growing, of course, but she's still got that lean kitten look. Just keep an eye on your little bugger. I think they're so rambunctious that they just burn it all off...or maybe my cat is just a nut. She's been eating just about a full can of wet food per day (the adult size can of Iams), and she occasionally nibbles on the crunchies...she's about 5 months old now. Is that about what your guy eats?
I think adult cats are supposed to get a can a day so I think that's about right if your kitten is 5 months old. They are considered an adult at 6 months old.