![]() While there’s not much that can be done about some of these factors, others are modifiable. ![]() Developmental disorders are also more common among boys some of these could shorten life expectancy. Survival in the womb is also less reliable for male fetuses (for uncertain, and probably multiple, reasons). The Y chromosome tends to develop mutations more often than X chromosomes and the lack of a second X chromosome in men means that X-linked abnormalities among boys are not "masked" by a second, normal version. The uneven playing field for boys starts early.
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