Given a choice, it seems human babies strongly prefer their mother’s body to solitary contact with inert cotton-lined mattresses. In turn, mothers seem to notice and succumb to their infant’s preferences.
This is a valuable clarification for two reasons: 1) it may be that babies have less biological flexibility than adults (although, they are also clearly plenty flexible) 2) parents' responses to their children are clearly assessed within a larger social context.
His point is that medical providers should not ignore the evidence that parents will prioritize babies' signals over doctor's abstractions. But I want anthro students to pay attention to the reminder that there are, in fact, significant other contextual factors that are weighed, and that we are biologically constrained to consider, not ignore, them.