Thanks for the helpful advices. The reason why I've been giving them extra milk is because they're 5 of them and she had milk coming only from 2 teets and they were crying. So I assumed some of them didn't get their fair chance. I wanted to make sure they were getting enough to eat. Some of them are bigger so the little guys were not getting as much to eat. Plus they're always hungry! I asked the vet what I should do and that was his advice.