Last week my cat had kittens. One seems to be in some kind of pain. He won't nurse, or move. He just lays in the side of the box crying and breathing very heavily. I really hope to know what is wrong with him.

Best thing you can do my friend is to speak to a vet, if only for advice.

I think he will then decide whether it's appropriate to pay you a visit.

I wouldn't leave it to long though.

I agree that the best thing to do is speak to a vet. However, if the cat isn't nursing, then he won't last very long. So if you can't get to a vet right away, you need to get some nourishment in him. You can buy cat milk replacement formula and small nursing bottles at any pet store and they even sell them at wal-mart. This doesn't always work and it is a real pain to do, but if you need something to sustain the kitten until you can get to a vet, it's a good thing to try.