We stopped at two, mostly because we started late.
We stopped at two as well. We were open to having more children, but we never got pregnant again after our 2nd. We know that one’s fertility/vitality/ability to conceive, declines with age. The fertility in both men and women decline with age.
We had three, and now have three grandkids.
The Middle, Working, and Upper classes need to have more kids. The underclass can have fewer, that’s fine.