This is what he thinks:
Her job - gestate, birth, nurture, watch, lose sleep over, change, hold, feed, bath dress them and cope with everything physical and emotional postpartum / drive the children to and from school and all activities / manage appointments, crises, household shopping / clean the house, do the laundry, feed and service MEEEEEEE. Because she is STAFF. And this will of course continue when she goes back to work.
(Does he also have the impression you're currently on holiday?)
My job - get a good night sleep because I'm the busy and important one, wake up refreshed and shower, breakfast, stroll into my study, focus on my job at all costs, pop a head out to refuse and criticise. Because ... 🤷♂️ income.🤷♂️
Too many men think like this. The be all and end all of the relationship is 'but I bring home the money'.
Draw up a 24 hour chart for the last week and mark in red every single hour you spent on wifework, mumwork, housework and what you did. Everything.
Every bit of lost sleep, every juggling three things at once, and also at the end note everything you didn't have time for yourself - shower, exercise, breakfast etc because you were busy creating his life.
Then add in the hours he spent sleeping, grooming, relaxing etc as well as actively working at his job, and actively working to bring up your family.
You will be putting in more hours work. While you are on MAT LEAVE.
Time for a formal house meeting, held and delivered as if you were both at work. Leave emotions and accusations behind. Talk KPIs, goals, objectives, feedback, 'going forward'.
You mentioned your marriage was rocky - then he wanted another child. I wonder if the second baby business rather papered over cracks in the marriage that are splitting open again?