I am sorry for your loss.
Usually when we have snakes come in with ANY kind of infection they go straight to the vet for tissue and saliva samples. Some antibiotics may not be effective against certain bacteria.
Baytril may not have been the best choice for such a young animal. I would have gone with Fortaz or Claforan as they are not nearly as hard on the systems of snakes, young or otherwise. Although, Baytril IS effective against at least one bacteria (that I know of) that is unresponsive to most other antibiotics. Whenever we have to give Baytril we always ask for the oral, not the injectible. Sometimes the treatment must include two different antibiotics as well as rinsing the mouth out with diluted Virosan..."hitting it from both ends" you might say.
Just a little info for anyone who may run across this problem in the future.