First, from one Turtles guy to another, congrats!
When I was expecting my first I took a break from buying and started selling off chunks of my collection, mostly due to a crippling paranoia that children would lead to instant poverty. While that ended up being somewhat true, my collecting sickness eventually returned, probably from staring at these forums and ebay at 2am on my phone whilst waiting for a newborn to fall back asleep*. One thing that did change is that I found having a stricter comics budget let me focus my buying much more and, I think, made my collection stronger overall.
*4 years later and I'm still waiting for him to sleep. No, seriously, get your naps in now. Like, right now. Go!