I do a lot of genealogical research. In the early history of our country this type of fertility was the norm. The average woman married at 18 and had a child every year or two until her early to mid 40s. This amazing feat transpired until the Civil War when many families suffered breakups do to the deaths of their breadwinners. I believe that this "extraordinary fertility" peopled our country the way God intended.
I am the oldest of 10 children. All of us are good tax-paying citizens and none have spent any time in prison.
Without interference, many couples would have double-digit families. Like any other organism, we’ve naturally selected to produce offspring ... and today, the survival of the offspring and parents is much more likely than in the past.