Birthrate by income levels is approaching a dumbbell distribution in industrialized nations. Lower income people have kids due to the lack of options, while ultra-high income people have kids due to the need for heirs (and they can afford to completely offload childcare to dedicated high-quality staff). Those in the middle are stuck because having children is a net negative to the continuation of career advancement, especially women due the unavoidable need for parental leave. The commitmments required to raising children, especially newborns, will disrupt travel plans which is a significant component of the typical middle class lifestyle. Childcare will also cost a significant sum of money, sometimes as much as mortgage payments in high CoL areas, without completely relieving the parents of their duties.
> without completely relieving the parents of their duties.
That's an underappreciated point. Kids in daycares and kindergartens get sick a lot. Those places are pathogen swapping grounds. Especially early on, you may have your kid 2 weeks in, 2 weeks out on average. And the "on average" is a killer, too - you can't schedule when your kid will get sick, so you're effectively on-call all the time anyway, and have to have a job compatible with you just taking off in the middle of the day and getting a day or two of leave, on the spot, at random.
