This thingy was at Mere Comments a while back. It looks at the "religious fertility" of a variety of traditions and categorizes them into four groups:
Religious Malthusianism idealizes 0-2 children
Implicit Natalism idealizes 2-3 children
Patriarchal Moderate Natalism idealizes 2-4 children
Patriarchal Extreme Natalism idealizes "the more, the better"
This struck me as another one of those times when we just don't fit. I have never heard any CSPP type say or imply, "the more, the better" (although they have been caricatured by their detractors as saying so, and worse). Once again, we are not Quiverfull™. The theology of the cross tells us that some won't get many or any and some will be overwhelmed. There is no right or wrong number. There is only faith's response to the gifts God would give, and faith's response to the gifts it does or does not receive.