Even if instead of NPV they simply paid lost wages/opportunity cost then it would be something. In Japan there is a lot of discrimination against young women because of fear they will go on maternity leave/not stick around. As a result, women don’t get promoted/hired, and if they do get pregnant are minimally accommodated. If we want to encourage women having children we need to compensate all the negative consequences they face in the workplace, and that’s tens of thousands of dollar per year.