hi J.;
i think you hit the nail on the head that OTCs should be used w caution for APPROPRIATE dosing. my son 3+, has suffered from congestion all his life esp. from too much dairy, and he used to get a lot of runny noses from dragging his pacifier around. i have always given him the right dose of OTC meds, cut way back on the diary, and made sure he was hydraetd, with good results. i wouldn't try to take him off dairy because he loves it, but i also am of the belief that kids will get colds and throat sickies all thier lives, it's just what happens, so i think it's best to use OTCs as you need them and not in excess, and don't worry about it.
my daughter, 20 mos, also gets wicked colds every time she teethes, which lately seems to be every day, and i do the same w her. we always use the Tylenol products because the grape flavor seems to go down wout too much hassle.
make double shure the baby stays hydrated as decongestants work in part by drying out the system, and also losing all that mucus will dry them out; so offer extra water all day. also try to make sure you get her OUTSIDE to play; even tho you may think you should keep a sick child in, getting them out will help thier metabolism and will clear them up ; also lots of exercise makes a kid sleep better, and better sleep helps them get well faster.
good luck!
j