I think you would be mad to do this. What would happen if you split up? Of course no one wants to think of that, but sadly it happens to about 1/3 or 1/2 of us. You owe it to your child to plan for the long term - you will have a LO to support for the next 20 years.
Baby’s father will have his well paid job at £60k and will see his child at weekends or evenings to he doesn’t have any childcare costs.
You will be unemployed with a child to care for and skills that are out of date. You won’t be able to afford the mortgage on your house on benefits ( or even a low part time wage ) so your ex will buy you out.
You will end up like many single mums in low paid jobs - in poor quality insecure housing and not being able to afford to work. Meanwhile you ex will complain about paying child support while you “ sit on your arse”.
If he moves in with another single mum ( as most men do) you will lose some child support. If he has more kids, you will lose even more.
So do NOT give up your work. Go back full time and split the costs of childcare ( like all bills ) in proportion to your earnings ( so he pays three times what you do ).
If your boyfriend doenst like his child being in childcare then he needs to give up his works and take the hit to his earnings, career prospects and Pension.