I don’t know if anyone else has heard this report, previously made and today vociferously defended on NPR and perhaps circulating elsewhere, about single moms producing fewer boys than partnered ones.
It seems a boffo exemplar of contemporary kinship anxiety.
The reported facts are as follows:
(1) Boys have always been born in slightly higher numbers than have girls
(2) Boy-baby pregnancies require a slightly higher energy investment on the part of the mother than do girl-baby pregnancies
(3) Recently, the boy/girl discrepancy has been dropping. There are still more boys born than girls, but not as many more
(4) Single moms contribute to this decline in the discrepancy — they are (supposedly) statistically less likely to have boys than are partnered moms.
The currently-circulating explanation is: somehow, humans are rapidly adapting to family instability; women’s bodies can “tell” if they haven’t got a male partner around to help out, they know it’s a big effort to produce a boy baby, and so they refuse to take any chances about male fetuses (or blastocysts, or implantation, or maybe even ovule friendliness toward Y chromosome sperm — the explanation part gets a bit hand-wavey here). To summarize: the bodies of single women are mysteriously inhospitable to male offspring.
The pop-cultural demographic take-home message, but of course, is: get out your tinfoil hats and await the parthenogenetic lesbian apocalypse.
But before we measure our heads for good fit, we might note that there is a gigantic black box in this explanation, capaciously enclosing the whole “how” part of the problem.
If all we need is an explanation that fits the available facts, with mystery clauses thrown in as necessary, I’ve got one, too — but I bet it won’t make the news.
It’s hard to see how energetics would operate any kind of constraining force, given that malnutrition is far less a problem for we moderns than it was for our ancestors. So let’s set the energetics aside. Although boy babies are energetically more difficult to carry to term than girl babies, they must be easier to successfully gestate in some other important ways — otherwise how to explain the ratio of boys to girls at birth, given the objectively 50/50 odds of conception? Working from this premise, one may as easily conclude (since we are unburdened by the need to offer any “how” account) that there is a positive rather than a negative message being received (mysteriously, of course) by single women’s bodies: “psst, you are in a position such that it is worth trying to bring off the rare girl rather than the more usual boy.”
Does this sound like a crackpot theory to you? Keep in mind it has as much to recommend it as does the reverse proposition, merely flipping the evaluative language.
The decline in boy babies is disturbing because of what it probably indicates about environmental contaminants. As for the single-mom part of the story, well — I can’t tell you why it is wrong, but I’ll happily offer a wager of $50 to the first taker that if will be thoroughly debunked within 5 years and probably much sooner. Unless that counts as internet gambling and could get Savage Minds in trouble, in which case I will satisfy myself with shaking my fist and intoning, Mark My Words. đ
