@NetFretForth
All we can do is mentor and encourage younger women, be positive about recruiting women returners, and try to make sure we don't make the workplace more difficult for people with caring responsibilities than it needs to be. But if anyone on this thread has more and better ideas, I'd be grateful for them. (This is, incidentally, an organisation that is good at part-time and flexible working, and pays decently for parental leave - about half my team are part time and almost everyone works flexibly in some way.)
IME, the mentoring by someone who gets the mental load stuff makes a huge difference. When I do that sort of mentoring, women often say 'why's it so hard, why am I failing?'. And then I ask what they're now doing that they didn't before. And the list pours out of them - from the obvious stuff (nursery runs) to the less obvious (needing to get to the supermarket because living off takeaway isn't OK with a weaning baby, but not being able to get the supermarket before or after work because of childcare and bed times, and so staying up very late doing online shopping for healthy food. Which they then cook. And clean up from. And store. And remember to de-frost. And note which ones not to make again because the baby hated it. And have an argument with their partner about how they're martyring themselves and surely they don't need to do all this crap and if they're that tired they should just go to bed earlier, it can all wait.).
Just having that conversation affirms that it is hard, they're not crap - but also that its survivable and does get better, and it's worth hanging on in there in the world of work, out-sourcing as much as you can afford and keeping pressing your partner to pick up at least some of the load.
Though that last is very, very hard - lots of women just give up on it because it causes too many rows and too much unpleasantness, and they're already fighting on too many fronts, and can't spare the emtional energy.