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To complete the subscription process, please click the link in the email we just sent you. Research over hundreds of years has consistently found that boys naturally outnumber girls at birth. This may relate to the fact that heightened maternal stress , such as would occur during wartime, can lead to an increased likelihood of a miscarriage which is more likely to occur among male fetuses. What do these two phenomena have in common? Pew Research Center does not take policy positions. Researchers hypothesize that both situations are associated with less frequent intercourse. For possible explanations of this association, see this article from the academic journal Human Reproduction. This increase in the sex ratio is driven largely by births in China, where sex ratios have declined slightly in recent years but remain the highest in the world. However, disproportionately large shares of baby boys are found in other countries scattered throughout Asia and the Caucasus, as well.

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