I was going to say that I think YABU, as you are actually on leave (albeit maternity leave) and have more opportunities to do more housework and shopping etc, and I do think you should do a bit more housework and general chores... But still, it's a unfair that you should so it all. I would say a 65-35 split would be OK when the baby is 5 months old. (You 65.) Although I would have said 50-50 for the first few months of the baby's life.
And you said he was lazy before you had this baby, so that is why he's leaving everything to you. And he will continue leaving it all up to you when you're back at work! What was he like after the birth of the first one?
You MUST put your foot down now, and tell him he needs to step up!
Anyway, I would be driven bonkers by him being at home all day 'working from home' as you can never relax and do your own thing and watch what you want on TV (in between housework and chores.) My DH tried to apply for a job that was WFH, (just 20 hours a week,) but he didn't get it, thank God! 😬
Thing is, what you are telling us @Cloudyonasunnyday doesn't shock me, and neither do the other tales of bone-idle men who are lazy around the house. Most men are like this. Although you will hear anecdotes from some posters who say they and their DH/partner split everything 50-50, and did do all through maternity leave/having children, but in most cases that simply doesn't happen.
Honestly, no wonder so many women these days are choosing to remain childfree. They have finally got a clue, and know what life is like for the majority of women who have a child/children. A bloody hard slog. As has been said, the woman/the mother is the default carer - always. Child not well at school or nursery or childminder, who is called? The child's father? No. Never. ALWAYS the mother. And the mother is always the one who is expected to use her holiday leave to care for the child too if the child is ill/off school for some reason. The mother is blamed for everything that goes 'wrong,' and if the child falls out with another child, it's the mother that the other parents come at. Never the child's father.
As I said, no wonder so many women are choosing a childfree life now!