That's not how it works with children. Unless you have abortion easily available for poor people and sterilisation easily available for folks that don't want children... you might not have a choice. If you are male, you can't force stop an accidental pregnancy. Luckily, though, male sterilisation is quite effective. It is generally more difficult for females to get sterilized (especially if you aren't married and/or don't have children), it has more risk of failure, is more invasive, and is more expensive. All other birth control methods can fail - people get pregnant on the pill. Condoms break. And so on. Your employer might not even cover birth control.

And these things don't even begin to cover things like rape, incest, and underage pregnancy where a guardian doesn't allow abortion.

Children are not always preventable

Other folks have already addressed the medical problems, so I'm gonna pass on it.