There's a lot more going on here than just purely money issues, which raise red flags over his behaviour to me.
Both partners work, but the OP is also seemingly the only one that cooks, cleans, tidies, and responsible for childcare.
If the partner wanted to use GP childcare to save money, that's fine, but then he needs to take equal (at least) responsibility for the consequences of that. It's not fair that the OP is having to make up her hours in the evening, and singlehandedly keeping the home going, whilst the partners life is unchanged. Why isn't he working in the evenings instead, but no it's the OP who needs to do yet more. It's even more unreasonable of him given that the OP is pregnant. Putting aside whether or not the OP has more disposable income then him, she's certainly not got as much free time.
I'm quite uncomfortable with the view that lots have here that his spending is the important mandatory spending (which it is) and hers the more flexible/frivolous stuff (which it is), and coming to the assumption that she being splurgy because she pays for those.
With their combined income, the subscriptions they have aren't unusual, and they are family things for all of them, it's just the way they are divided. For all we know, his mortgage (that everyone keeps going on about) could be smaller than their monthly food bill. It's entirely possible that the expenses are split according to their income, but just with the more discretionary stuff on the OPs side.
According to google, the average monthly mortgage payment is just under £800. Obviously there are bills on top. Food is probably around £500 a month. It probably is split 30:70 which is about right given their different incomes.
Again, presents. Yes, she 'should' cut down, but she's responsible for all present buying - it's not just for her family and friends, but their joint child and his family too.
This could just as easily be a couple where she pays the mortgage, amd maybe a couple of bits, and he pays for everything else, and the numbers would probably come out similar. But she's look frugal, and him splurgy, because the discressionary family stuff is paid for by him. Does it really make it indulgent for one person to pay for netflix when its a family decision to subscribe