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A hormone that is released when someone is under physical or emotional stress has been found in breast milk and appears to affect babies differently depending on their sex, a study of laboratory monkeys has shown. Scientists found that levels of the stress hormone cortisol in breast milk can vary between mothers and that it affects sons and daughters in a different way. The researchers believe the same is likely to be true for human breast milk. Female babies fed on breast milk with relatively high concentrations of cortisol showed behavioural changes, such as irritability, fear, anger and discomfort, which were not shown in sons fed on breast milk with similar concentrations of the hormone, said Katie Hinde, an evolutionary biologist at Harvard University in Cambridge, Massachusetts.

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