I think you need to sit him down and say "We need to do some financial planning". Tel em, "We are in a marriage and now have afamily, so that means we need to plan things together as we have joint reposnbilities" (BTW - was the decsion to start a family a joint one, or did you "push" him?)
Take the lead - show him he is not the only one who is savvy about money.
Do yuo know roughly how much he earns (take home) a month?
Put together budget: what are the monthly outgoings? Martgage, insurance, council tax, utilities, child care. If you don't know, but he does, ask him to provide the figures. Tel him that it is your intention to set up an account that is purely for dealing with these outgoings.
Then put together your regular income: yours and his. At this stage, don't talk about how much each is going tob e divided. However, you can point out that if you didn't work part time, then the cost of the child care would increase to x. Also remind him that if you were working full time, you wuld expect/need him to do far more at weekends (you might want to tell him that anyway! )
The talk about plans: what do the two of think needs to be done over the next one year/two years/fivre years? Is the bathroom a priority for both of you? What sort of budget can or should be allocated to it? If he doesn't want to do it yet, how much of the household income should be allocated to saving toward it?
Now you can talk about how much of each of your salaries should be going in to the joint pot - into that account you told him your were going to set up. How much do you think you need for your own requirements? What family savings shuold be being built up for contingencies? If your salalry is all already used, up, ask him what he thinks the alternatives are: after all, your child was a joint effort . Does he want to give up a day's work, so that you can work an extra day. Tell him that is not your preference, as you know that he earns more - and that you were otherwise happy to carry out the child care for two days, but that you need to know that yuor contribution is valued.
Tell him that it is your preference that this account should be a joint one - so that you can both access and manage it. Trust cuts both ways.
Keep it all very business like - and emphasise that you are trying to plan for the future, so that you can do thinkgs like replace the bathromm when he is happy that you (you as in the "family unit") have sufficient savings to do so.
DH and I did have issues about money for a while - but never about sharing it. He was the one that wanted everythng to go into a single joint account, where I was the one who wanted some independence (although we bith always knew what the other was earning).
In the event, we both maintained our single accounts, set up a joint account, out of which all bills are paid, and we both pay in us much as we can into that account, only keeping back what we consider we need for our own use that month. Anything left over from the joint account goes into joint savings (sometihme single savings, as ISAs). But this apporach assumes a adegree of selflessness and trust that I am not sure that yuor dh has.