All things that drove a wedge in my marriage after having kids. And it wasn't until after (a lot of) therapy, that I realized the main issue was:
We didn't have a clear idea of who was responsible for the stuff with the kids and the house.
So we sat down and made a massive list of all the things we have to get done, and assigned each task so that we would never fight about who was emptying to diaper genie.
And to keep things simple, I made you this Ultimate Relationship Chore Agreement.
All you need to do is print it out, and spent 5-10 mins with your partner walking through who's going to do what.