This isn’t my experience at all.
I took 12 months off after maternity (good Mat Pay on the NHS) and then took three months off unpaid which we had previously saved for.
My husband then bore the brunt of our finances as I wanted to go back part time (25 hours) thus reducing my income.
As a result of dropping my hours I do believe that over the next few years it did restrict my opportunities to climb the ladder, where’s my husband climber his ladder very well, but I never resented him for it.
My youngest is now almost four and we are now relocating to a different city so I can do my dream job. My husband has never complained once about it, and although it makes his life harder, he’s 100% behind me because he knows how much this job means to me.
He does absolutely more than his fair share with the children and if one of them is sick and can’t go to school/childcare then we take it in turns of who takes a day off work.
I understand that some families end up with a different and unfair dynamic once children arrive, but it doesn’t happen to everyone.
I agree though that generally the process of having children does burden (for want of a better word) the woman more which is unfair in the 21st century but as a previous poster said, the only way to avoid it is to not have children I guess which is a ludicrous solution.
Women should be able to have children with the end result causing life changes that affect the woman and man equally, and it isn’t fair that it’s not the case.
I don’t know what the answer is, but if you are starting to feel resentful of your partner (understandably so) then maybe you need to find a way together to try and get your lives back on a more equal footing.
Sympathies to you OP because it does sound like you’re having a rough time with the unfairness of it all - and I really hope you can find a way forward 