It is normal enough for prospective parents to wonder about the sex of their unborn child. When their doctor shares their curiosity, though, he may well fear the presence of some sex-linked hereditary disease such as hemophilia, or certain disorders accompanied by mental retardation.
But even if today's doctor knew which sex to expect, and even if he could predict trouble, there would be little for him to do except prepare to interrupt the pregnancy or to provide treatment after birth. Soon, however, prenatal care for fetuses still in the womb may be possible for a host of problems. And...
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