i have 4 foster babies, 8 weeks. I currently feed them 3x a day. They are always hungry. I know with kittens you free fed them. Its that the case for 8 week olds too? They are 1.25- 2.20lbs. eats 110 calories a day. All gain weight everyday. 3 are food aggressive and dont know if they will stop eating if they get full. Should I feed more?