My kitten was just 8-10 weeks old when he broke his leg at the hip. The vet recommened several things from putting in a pin, amputation, to putting him to sleep. The vet insisted that the injury would not heal by itself. He told me to give him baby aspirin to keep him comfortable while I decided upon a treatment. I'm happy to say that while trying to decide upon treatment the kitten started running, jumping, and eve walking on rails. Baby aspirin kept him comfortable and bones healed fine. My step-dad (the doctor) says that if kids break a bone and you can put both pieces in the same room they will knit together and heal, guess kittens are the same. Hope your baby feels better soon.