Abstract
A more detailed analysis of factors contributing to the overrepresentation of first-borns in college populations is afforded by comparisons of years of schooling between siblings. Analysis of educational differences within twochild families reveals that: (1) first-borns attain significantly more education than their last born siblings only when the firstand last-born are of the opposite sex and (2) there is an overrepresentation of the cross-sex twochild family in three independent samples. The widely reported overrepresentation of first-borns in college is thus a function of not only ordinal position, but also sex of the subject and sex of the sibling.
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