I feel like Ozzie handled it the best of all of them because he was fully prepared for it and the baby was so relatively tiny. The second kids were definitely 'better' for both Blitz and Zim when compared to the first since having a previous experience at their back and being better settled into their relationships helped a lot.

I think Blitz gets 'the wreck' title considering the whole, y'know, 'nearly tried to abort the baby by almost killing himself after a nightmare about how he was going to ruin their life' thing.