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Republish our articles for free, online or in print, under Creative Commons licence. Some babies are born with a genetic variant that leads to atypical sexual development. It can result in the child being neither a typical boy nor girl.

Baby formula should be tailored for boys and girls to reflect the differences in milk that mothers produce depending on their baby's sex, researchers say. Tests on mothers' milk in both monkeys and humans have showed that levels of fat, protein, vitamins, sugars, minerals and hormones vary enormously, but there is evidence that milk made for female and male babies is consistently different. The make-up of the milk has a direct impact on the child's growth, but also on his or her behaviour and temperament, which may last for the rest of their life. Scientists suspect that breast milk may be tailored by nature to meet the different growth needs of the sexes. The findings have led some researchers to suggest that baby formula should come in boy and girl formulations to match the differences seen in breast milk. But when mothers fed female babies, their milk was less fatty and had more calcium, probably to support the faster growth of their skeletons.

Single-sex education, common in the United States until the 19th century, when it fell into deep disfavor except in private or parochial schools, is on the rise again in public schools as educators seek ways to improve academic performance, especially among the poor. Here at Charles Drew Elementary School outside Fort Lauderdale, about a quarter of the classes are segregated by sex on the theory that differences between boys and girls can affect how they learn and behave.

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