Biologists of a neo-Darwinian bent have a theory to explain all this. Homo sapiens, for most of its evolutionary history, has been a polygamous species. If you are a high-ranking member of such a species, your son is likely to attract many female mates and thus furnish you with far more grandchildren than a daughter. If you are lowly, though, then your son may fail to win any mates at all, whereas your daughter can at least get your genes into the next generation by joining a harem...but like the sciencenews article(fourth link)he thinks the "causative agent" for the skew could be hormonal.
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"When I looked at my son, adorable though he was, I saw a stranger. Where was the daughter I had been talking to for nine months?"
A while back, way before you could know what sex your baby was, there was a big survey in Italy focussing on a mother's first words after her baby's birth. About 10% wanted to know whether it was a girl or a boy. The rest just asked "Is it perfect?" This roughly means "Is it healthy?".
As the father of two identical twin daughters, prematurely born, I find it strange that people would want their babies to have a specific sex. Isn't it more than enough for it to be alive and, if possible, healthy?
Though daughters are much better, of course. At least for a man...
posted by MiguelCardoso at 9:15 PM on April 11, 2002