Hello, around a year ago, my rat had 11 kittens. they where all healthy except for one. Her leg was disfigured, black, cold, and broken. Most people said the mom was going to reject her or she was going to die from infection. I went to the vet and all they did was they put a really small rubber band around her leg. This eventually caused her leg to fall off and now she is healthy. I just posted this for anyone who is having similar issues.