D.P.
Hmmmm... Is it possible that when you're fighting it, instead of it going completely away, it merely gets down to so little you think it's gone -- then, it rears its ugly head again -- this time stronger and more resistant to antibiotics? Eight separate times seems crazy...
My advice is a specialist. Get to the bottom of these infections. Either it's not getting dealt with in full each time or there's something going on that he's being reinfected.
Poor baby! Poor mommy!