Hello, first post here. My cat recently had 4 kittens, they are about 2 1/2 weeks old. Two gray tabbies, a black one and a tuxedo. A few days ago I noticed that 1 of the tabbies has a flat chest. After checking the others, the tuxedo one also has a flat chest. I had never seen this before, nor even heard of anything like this. I just did some online research and now know they have FCK. The tuxedo kitten seems just fine except that he seems to be having a little trouble crawling. I'm worried about the tabby though. He's got the "swimming" appearance, his front and back legs go out to the sides, and he appears to be breathing more rapidly than normal. I'm going to take them to the vet on Tuesday. I'll know more then.