My cat had kittens some yesterday (12/31/12) and some today. I had the same thing happen to the kittens. umbilical cord was tangled around 5 kittens but only two were injured. the cord was around ones (tiny) waist with both legs caught as well, cutting off the circulation from the waist down. another kitten ( tim) only had one leg caught. the kittens must have been tangled for a while because by the time i noticed it tinys legs were black and tims leg was dark blue and red. Tiny died not too long ago because it was basically paralyzed. he couldnt walk to eat. Tim is doing fine, the leg is swollen and pink but the paw is still dark blue. its warm but cold. no shriveling on tims leg.