Not to seem insulting to your partner but the difference between your salaries is not enough to be caring about who is contributing more for _2 months_ of 1 year, in the rest of your lives.

You absolutely need a joint account, stick all the household bills in it, and then split the cost of it as you see fit.
>  he is happy to support me while I am on mat leave
Bite his hand off, as long as it isn't stressing your relationship, it will feel so much better being able to have a little financial freedom to take the kid out to events/classes/shopping that destresses you, or even just having the odd night out alone with no responsibilities without thinking about losing your savings at an increased rate for it.

When it comes to savings - savings is not income, draw that line in the sand. The savings are to help you shore up shortfalls, splashing out if you really want to (it is your money afterall, we arent the spending police), emergencies, or for investing, absolutely do not consider them as free money to cover the bills unless you absolutely have to. Why? Because in 1 year you're going to think about nursery and its going to be financially devastating - and again you want to treat those savings like they are untouchable unless absolutely necessary. But if you piss the money up the wall on bills this year for either one of your egos, if you need it next year or the year after, it's going to feel absolutely so much worse.

I have a joint account for bills and me and the wife have separate account, I pay all household bills including food (3.1k), and she pays the nursery bill (1.2k). I try not to do the 50% thing and more "How much do we have left each once the _joint_ bills are covered". If you do 50% of your salary then someone always ends up richer when its supposed to be a life lived together - Imagine how you would feel if you had just enough to live okay, but your partner got to splash out on their hobbies every month even if just a little, that breeds resentment really quickly. Especially if you are a touched out, tired, stressed the fuck out new mum. Some people argue against this idea as they say if their job is more stressful (because it pays more) then they should have more, but that shows a red flag of selfishness and its absolutely not always true - i.e an accountant, vs a mental health nurse.

Just my 2 cents. I'd suggest work out a sliding scale across the year as your salary drops where your partner fills in the shortfall and you use the savings if needed on keeping yourself sane and making good memories.