I agree with sevenstars - children absorb the fact they are cared for by women, at home, in childcare, in primary school. The modelling of being a good 'feminist' by working is further undermined when we come home and do all the domestic labour.
There is a fundamental inequality that is shifting slowly, talking about it, questioning it and being unafraid to speak about your own experience is important. I address the fact that I am a sahm with my children directly. I don't hide the fact that my employment prospects and earning potential have been affected, I talk to them about social and economic inequalities. I volunteer at citizens advice so I talk in general terms about social issues people face. Children are philosophical by nature and can process complex ideas and understand injustice very well. I give them credit for appreciating that I have made sacrifices but ultimately I made a selfish choice to have children, I made further choices to look after those children and that there are consequences. DH and I were probably as naive as any new parents 14 years ago but we would probably make the same (constrained by circumstances) 'choices' despite any problems I face now in returning to work.
I hope things will improve, not just by making it easier to access childcare, but by new ways and hours of working, longer life spans mean we have to accept we will be working for longer, but in different more healthy ways I hope. DH has recently benefited from being able to work from home, I will be free to work more as a result. You can hold many roles/ identities in one lifetime so I don't intend to be categorised or written off for simply one aspect of 'me'.