We went through a similar patch after both our DS were born. Firstly you need to remember that each partner is going to have a different expectation of what should be done by the sahp. At this point your bubba probably senses the stress & this unsettles him also.
We both work part time so share the sahp role. The first thing DH did on his day was to enrol DS1 into swimming lessons. (Our pool has occasional care, so DS2 goes into that during the lesson). DS2 then gets some water play after the lesson with dad & brother. Each were much happier when they had a focus for the day. We also had to recognise that housework doesn't always get done, so had a minimum level of what needed to be done. With kids in cloth that was laundry. If anything else gets done tats a bonus. But we had to work as a team on days when we were both home to get the place in order. If meals are a problem, invest in a slow cooker, put everything in it in the morning & it's ready by dinner. Freeze a loaf worth of sandwiches & toast them for lunch. Seriously, an hours prep time on a Sunday afternoon gives us meals for most of the week. If your DH is struggling too much, maybe look for an occasional care to give him a time out for a couple of hours 1 day a week.
It does get easier as the baby gets bigger & can play on their own more.