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Sex differences in outcomes of very low birthweight infants: the newborn male disadvantage
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    Vulnerability by sex and evolutionary theory

    Dear Editor,

    In a recent article Stevenson and colleagues[1] report further data showing increased vulnerability of male compared to female infants in early life, and comment that the biological mechanisms contributing to the male disadvantage or female advantage have not been elucidated.

    In fact, male vulnerability in early life is consistent with an aspect of evolutionary theory described by Trivers...

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