What matters is selection based on merit, not quota filling. All the
PR-spin 'first at whatever' stories are meaningless drivel in a world where sexism/racism is illegal and young girls can become Queen and PM.
And yes it is possible to be a success in business or whatever chosen career path, AND a mother, but the few examples you can hold up as role models are notable as exceptions (Horlick/Roddick/Thatcher).
To clarify, if the business/political/military worlds were meant to be statistically representative of society - then all the naturally talented and able women (who want to sacrifice their family time) would be in 50% of top positions by now. Human nature and biology say that is not meant to be so - so they are not.