Supplementary material from "Human infancy and parenting in global perspective: specificity"

We address three long-standing fundamental questions about early human development and parental caregiving within a specificity framework using data from 796 infant–mother dyads from 11 societies worldwide. Adopting a cross-society view opens a vista on universal biological origins of, and contextual influences on, infant behaviours and parenting practices. We asked: How do infant behaviours and parenting practices vary across societies? How do infant behaviours relate to other infant behaviours, and how do parent practices relate to other parent practices? Are infant behaviours and parent practices related to one another? Behaviours of firstborn five-month infants and parenting practices of their mothers were microanalysed from videorecords of extensive naturally occurring interactions in the home. In accord with behavioural specificity, biological expectations and cultural influences, we find that infants and mothers from diverse societies exhibit mean-level society differences in their behaviours and practices; domains of infant behaviours generally do not cohere, nor do domains of maternal practices; and only specific infant behaviours and mother practices correspond. Few relations were moderated by society.