How sustainable is child-bearing?

If you haven't seen the Dugger Family show, you are missing a great real-time experiment in sustainability.

Mom Michelle, 42, had her 18th baby today, according to AP.  She told a local news writer that "as long as God wills it" she will "continue to add to the brood."

Without rendering any judgment on Michelle and her family, is this sustainable? Not just for the economy and the environment, but the kids' psychological development? I recall reading that you should only have as many children as there are parents. (For another take on the less is more, check out Hank's blog on small people.)

So, people who know more about this than I do - is this in way a good thing?

Old NID
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