Beyond the resistance stuff there seems to be mounting evidence that giving kids antibiotics effects their health down the road. Not giving them here and there when they might really need them but prescribing them frequently. My kid is two and a half and still hasn't had antibiotics which I'm pretty happy about. She has had frequent winter colds colds and a few earaches but nothing we haven't gotten through. Her doctor seems pretty hesitant to prescribe them as well, she always get the bad news demeanor when she tells us she thinks we should just trudge through an illness while we are absolutely on the same page.
I don't know if you've checked out this article but I found it interesting that doctors are starting to look at how bacteria and the human body function together to maintain our health.
Microbiology has gotten really cool of late. For years, nobody could get some species of bacteria that are naturally found in our bodies to grow in culture. It was recently discovered that some of these bacteria need different species of bacteria to grow, presumably whose waste products they need to survive. So we have a situation where the bacteria need each other, and we need them. It's fascinating. Always remember, 90% of the cells you carry on you aren't human cells.