I have three kittens, all are about 14 weeks of age. Last week the runt weighed in at the vet at 2 lbs, 4 oz. This week he is 3 lbs. the long haired orange tabby male weighed in last week at 2 lbs 14 oz, this week he is weighing 3 lbs 12 oz. Are they gaining to fast? I have their food bowl filled with Nutro kitten all day long. Since there are three of them, and I am not home all day, I can't figure out how to limit the food intake without putting them all in separate rooms all day