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Boys demand more than girls, even before birth

Swedish and American researchers have solved the puzzle of why baby boys are so much bigger at birth than girls, their mothers eat more during pregnancy. Women carrying male embryos consume about 10 percent more calories, eight percent more protein and have a higher intake of carbohydrates and animal and vegetable fats. It is widely accepted that on average newborn boys are heavier than newborn girls.// The findings give us a better understanding of why that is the case.
Researchers studied the diets of 200 women during their second trimester of pregnancy. They believe women carrying boys eat more because they have a higher energy requirement, which could be due to testosterone secreted by the foetal testicles. But although they produce bigger babies, mothers of boys do not put on more weight than other women during pregnancy because the gender of the baby had no effect on maternal weight. These data suggest that in utero boys are already more demanding than girls.

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