my DS started nursery in January and has predictably been picking up all the bugs since then. In February we ended up at the GP as he had a cough/ cold that was quite bad with high temps etc. the GP prescribed antibiotics to use if he got worse and not better - he didn't need them.
Since then the cough has lingered but not been too bad - i phoned the GP again for advice at one point and he said for every 30 babies given antibiotics probalby only one would benefit. we just carried on waiting for it to go away by itself until last week when it seems he got a new cough/cold combo and he now has a really hacking cough waking him in the night, his little chest is so rattly. 
I view antibiotics as the last resort and know they aren't a miracle cure - but DH and I are now wondering whether its worth a try?
What would you do?
Meanwhile I have a 3yr old DD with impetigo who I am having the same dilemma about - off to start another thread!