How would you feel if your baby was bitten almost 200 times by a rat? Probably pretty bad, especially if it was your own pet rat that did the biting.
OK, first of all, who would bring home a rat he finds at a creek? Secondly, who would keep that rat in a cage in his bedroom? And finally, who would make that cage escapable so that the rat might attack his newborn? To answer the questions, this is who:
Having a pet rat is one thing, but having a pet rat that likes baby meat is completely unacceptable (in this context).