Knifegill, I sort of agree with Moluv.
I have been twice through nursing a newborn, I was sharing the load with my wife except for breasfeeding with our first child. The second one was unfortunately on formula due to my wife's poor production. Anyway, I could not care less about WO routines and diet, the house was a mess, sleep was horribly fragmented, etc. I was cooking without refined sugar or excess shit but relied half of the time on prepared meals from local take-aways. I gained bad fat during that phase but that's just how it is. It is easy to lose it again once the baby phase is over.