Breastfeeding behaviours can significantly change mothers' physiological and psychological states. The hormone oxytocin may mediate breastfeeding and mothers' emotion recognition. This study examined the effects of endogenous oxytocin fluctuation via breastfeeding on emotion recognition in 51 primiparous mothers. Saliva oxytocin was assessed before and after the manipulation (breastfeeding or holding an infant), and emotion recognition tasks were conducted. Among mothers who breastfed daily, mothers with more increased levels of oxytocin after breastfeeding showed more reduced negative recognition and enhanced positive recognition of adult facial expressions. These oxytocin functions accompanying breastfeeding may support continued nurturing behaviours and also affect the general social cognition of other adults beyond any specific effect on infants.

中文翻译：

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母乳喂养会动态改变母亲体内内源性催产素水平和情绪识别。

母乳喂养行为可以显着改变母亲的生理和心理状态。催产素激素可能介导母乳喂养和母亲的情绪识别。这项研究检查了通过母乳喂养引起的内源性催产素波动对51名初产妈妈情绪识别的影响。在操作前后（母乳喂养或抱着婴儿）评估唾液催产素，并进行情绪识别任务。在每天进行母乳喂养的母亲中，母乳喂养后催产素水平升高的母亲表现出的成人面部表情负向识别减少和阳性识别增强。