seriously?

ok so i did my job by reading more on the cephalexin for vince's sake..on ithink it ws drugs.com it says not to use if you are allergic to penicillin..we have told vince's doctor there is a chance he is before and that we would prefer him not be given this as he has enough issues going on..so how much arethese two meds related? he seems to be fine and he has had 3 doses so far..his poo is becoming aqishy and he does not want to eat real food only gummy bears and a few cherrios..so feeding him yogurt is not going to work..so i am gonna have to try yogurt juice..also how do you tell the differance between diareah and C-Diff? especially when the child can not tell you how they feel? also does anyone know what the liquid probiotics smell or taste like? vince is so picky and AFRAID of anything that goes near his mouth!