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Royal Boy or Girl? Science Says Girl

Sweet little girl in pink laughing

As speculations about the gender of Prince William’s and Kate's baby reach a fever pitch in the final days before the duchess’s due date, scientists are also chiming in and placing bets.

Their wager? That it’s a girl. For one, they say, the sex of a child isn’t entirely up to chance. Consider this: Worldwide, slightly more boys are born total—105 to 106 boys for every 100 girls. But from there, what a pregnant woman eats can also give clues.

In one study, Fiona Mathews, director of the program in biosciences and animal behavior at the University of Exeter in the United Kingdom, polled 740 women about their diets early during their pregnancy. Those who ate more calories were more likely to deliver a boy instead of a girl.

This may happen because male embryos develop faster in the womb, and may therefore need more food. “What we seem to get is this general idea that when conditions are really favorable, then that male embryo can survive and can keep developing,” Mathews told CNN. “Whereas maybe when conditions are a bit tighter—less nutrients are available—then it’s only the female embryos that manage to survive.”

Stress can also play a role. For instance, according to Mathews, more females are born during times of crisis like earthquakes and other natural disasters. Women with stressful jobs are more likely to have a girl as well.

Last but not least, consider the father’s job. One study in the journal Norsk Epidemiologi found that airline pilots are more likely to have girls instead of boys.

None of this is a definite crystal ball into a royal future, but we guess we'll see pretty soon who's right.

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