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This is precisely one of the cultural obstacles to correct. I have to disagree: If a cultural obstacle at all, to me it's rather labeling civilizational accomplishments like ownership or property rights as a "cultural obstacle".
> We value individuality foremost and I believe its among the top reasons parental leave is incomprehensible to many people
While I can't speak for the US, in Germany we have a pretty generous m/p/x-aterinty leave system. But still only a few fathers take advantage of it. Certainly it's not because of culture (it's not the 1950s anymore). It might be just the plain truth that it is deeper ingrained in us.
Another big factor is the high increase of bachelor degrees. 40% of our high-school students [1] go to college [2], of which 3 out of 4 finish. By the time they finish they are in their mid-twenties and depending on what they've studied [3] will add another two years for a masters degree. In effect you'll get women who enter the job market 10 years later than their mothers did. So when the biological clock ticks louder they are often faced with a dilemma: Either less kids than originally wished for, or give up your first career years in exchange for fitting as much child-bearing in them as possible.
Again, I don't see how individualism is at the epicenter here. Instead I'd take a good look at lack of intelligent regulation (nudging), medicine and misguided education policy.
[1] & [2] since educational systems are complex to translate, I just went with the most aproximate US counterpart
[3] mostly because the job prospects in a given field are non-existent with 'just' a bachelor's degree