>U.S. society has decided that it must be very costly for young women to have children

I'm pretty sure U.S. society isn't the one responsible for the fact that raising a child consumes significant resources and makes obtaining other goals much harder. The time spent caring for a baby makes it harder to complete higher education. Even if offered help, a baby takes a lot of time.

Also, this isn't something that only applies to young women. A single father has to sacrifice a lot of time to raise a child. While the initial pregnancy is not as bad for the single father to deal with, the time spent with a child that could be spent on anything else is a significant factor for the next 18 years.