...your emails to the pediatrician go from
"I don't know what's wrong, but her nose is running and ohmagod, I think she might have a temperature of 99.1 and I think we should be seen right this very second, I hope we make it, OH MY GOD!" with your first to...
..."Yeah, he sounds like he's been smoking a pack a day his entire life and runs a low grade temp, oh, all the time...but I'm sure he's fine unless you REALLY think he needs to be seen...." with your second.
Good news is my formerly all-encompassing hypochondria has taken a back seat.