I am so sorry to hear that your baby has cdiff. Whew, that is too much! I think that as long as you are not on antibiotics, you are not too likely to get cdiff again from him. If you haven't read the Hygiene info in FAQ, be sure to do that. Washing your hands (until they are about to fall off!) is the best thing. And bleaching laundry, in the bathroom, and even in the kitchen really helps.
I would talk to his doc about any antibiotics in the future. Be sure that he really needs them. There are often alternatives. I just read something (I wish I could remember where) about ear infections, to the effect that antibiotics are often overused in treating them, and that most children would get well without them. Good luck. Let us know how it goes.