Children's Health

Why are premature baby girls more likely to survive than boys?

A Answers (2)

  • A , Internal Medicine, answered
    When babies are premature, females have more mature brains and are usually much better off neurologically, so they're more likely to survive. The evolutionary reason for this is that females are much more precious to a society because of their childbearing potential, but men are expendable (since one man can impregnate multiple women). Because of this, brain development is built more to spec and much more precisely in females, meaning that there's less variation in how girls' brains develop.
  • A Pediatrics, answered on behalf of
    Although the exact reason is not known, it is assumed that the hormones that make are unique to girls at birth also help mature the lungs and other organs (brain, intestines) in baby girls which improves their chance of surviving. While survival of girls is better than boys, the difference is relatively small and many other factors also play a role in survival.
Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.
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