The presence of hormones and other bioactive compounds in human milk is the focus of a recent and expanding research emphasis leading to theories that they aid in the maturation and functioning of physiological systems in young infants. The possible consequences of a lack of these in early nutrition on subsequent development of the neonate has implications in light of the unexplained decline in breast feeding in the United States since the mid-1980s.
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Ellis et al. (1992) studied this question.
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