In 10 years, will you regret the moments you missed or the money you didn't make? Money can always be made, but you can never go back and recapture those moments. They're gone. Other people stand in your place in your child's mind. You still have a place, but it's just smaller.
I don't get the idea of working for maternity leave money. How much could that be? Is it worth putting your current little baby in childcare just to get a little money?