Study: Couples Who Smoke More Likely to Produce Baby Girls Posted by Scott Manning on April 19, 2002 | Comments (2)

Couples are more likely to have a girl than a boy if either of the partners smoked heavily while they were trying to conceive, new research suggests.

Some scientists consider the ratio of male to female births to be an indicator of a population's health, because male sperm and embryos are more fragile than their female counterparts. Full Story...