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This article provides a novel synthesis of anthropological research on infant sleep, focusing on work in biological and sociocultural anthropology in the past decade. First, we briefly review early biological anthropological research into infant sleep from 1987 to 2007, which provided the evidence base for the argument that proximate parent–infant sleep combined with lactation represents a complex set of adaptations that constitute the human evolutionary norm. This work challenged the Western pediatric infant sleep research paradigm, which positioned formula‐ or bottle‐fed solitary sleeping infants as the basis for research and universal models about human infant sleep. Next, we address how recent research has built on these foundations and extended anthropological insights into new aspects of infant sleep. Biological anthropologists, who continue to lead this research, have advanced into the hormonal and …