The stray cat that I've been taking care of gave birth to her kittens last Sunday morning. They had no problem nursing the first day but as they get bigger they seem to fight more at feeding time. According to everything that I've read, kittens pick one nipple that they tend to return to. In my case, I've got 2 of the larger kittens that seem to constantly disagree as to who should be nursing where. If one is on a nipple the other one will crawl on top of them and claw away with their little paws until they've removed the roadblock. It wouldn't be a big problem except for the fact that the smallest kitten in the litter really can't seem to stand up to them. They were all approximately the same size at birth, but he seems to be gaining weight slower than the other 3 and is a little more than half their size. Should I look into supplementing his diet to ensure that he's getting enough food to stay healthy?