That's my point really; women are still expected to bear the brunt of child rearing, so pay the financial penalty. Cf Norwegian policies and smaller gender pay gap.
Women aren't expected to do anything; the proof is that birth rates are falling all across the developed world.
Consider two women, A doesn't want children and B does. How do you think A will feel having worked hard for a year while B was on maternity leave, only to find that B's seniority etc has kept up with zero effort or contribution to the company on her part?