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Well, they mean "That especially matters to mothers" even though they wrote "That especially matters to women". So it isn't as groundbreaking as the headline seems.
The consequences could reverberate for generations. Benefits like paid leave and child care affect not only caregivers’ ability to manage work-life balance but their lifetime earning potential: Studies have repeatedly shown that having access to paid leave and child care leaves women free to rack up the promotions and raises that enable them to support themselves and their families.

I really never thought about it like that.