This Jarom 1:8 phrase is used throughout the Book of Mormon and appears to borrow its language from the Abrahamic covenant in Gen 17:2 and elsewhere. It appears to be an apt description of the early Utah Saints, who saw themselves as modern heirs of the covenant. Mormon women welcomed many more children into their homes than their national counterparts, a phenomenon I attribute largely to polygamy.
As a disclaimer, I realize that this blog entry is not in good taste, especially from a feminist perspective. Some of the quantitative analysis that follows will no doubt feed into Mormon stereotypes that we like to keep our women barefoot and pregnant.