I sometimes wonder whether flexible working (which has become the norm in terms of the platter of HR benefits offered to professional women) has resulted in more women being sidelined that if there was not that option.
If it has the result of keeping women in work who would otherwise completely dropped out, it is good thing. But if it has the result of encouraging women to go pt who would otherwise have continued ft, then there's your answer. It also skews employers' attitudes towards women if so many of them request flexi working after children.