My cat had 5 kittens 3 weeks ago. One was born smaller than the others and is now about half the size of the others. It can walk barely and it's eyes are open. I don't understand why it's so small. It is also boney compared to the others which seem fat. I think maybe the others aren't letting it feed and it will only get worse because they appear to be much stronger. About every couple of hours the mother gets out of their bed and lies beside it and I'll place that kitten out there with her so it can feed without competition. I'm concerned the little bugger won't make it. Any advice is much appreciated.