The excess of boys in infant deaths has increased in the 20th century as infant death rates have declined. This inverse relationship is demonstrable in New York city and in a compilation of rates from advanced and underdeveloped countries. The increase in the male disadvantage in surviving infancy is not a function of time alone.
Abramowicz M, Barnett HL. Sex Ratio of Infant Mortality: Trends of Change. Am J Dis Child. 1970;119(4):314–315. doi:10.1001/archpedi.1970.02100050316005
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