Objectives: This paper investigates infant feeding practices through stable carbon (d 13 C) and nitrogen (d 15 N) isotopic analyses of human bone collagen from Kamennyi Ambar 5, a Middle Bronze Age cemetery located in central Eurasia. The results presented are unique for the time period and region, as few cemeteries have been excavated to reveal a demographic cross-section of the population. Studies of weaning among pastoral societies are infrequent and this research adds to our knowledge of the timing, potential supplementary foods, and cessation of breastfeeding practices.Materials and methods: Samples were collected from 41 subadults (<15 years) and 27 adults (151 years). Isotopic reference sets from adult humans as well as faunal remains were utilized as these form the primary and complementary foods fed to infants.Results: Slight shifts in d 13 C and d 15 N values revealed that weaning was a multi-stage process (breastfeeding, weaning, and complete cessation of nursing) that began at 6 months of age, occurred over several years of early childhood, and was completed by 4 years of age.
Discussion:Our results indicate that weaning was a multi-stage process that was unique among late prehistoric pastoralist groups in Eurasia that were dependent on milk products as a supplementary food. Our discussion centers on supporting this hypothesis with modern information on central and east Eurasian herding societies including the age at which complementary foods are introduced, the types of complementary foods, and the timing of the cessation of breastfeeding.Integral to this work is the nature of pastoral economies and their dependence on animal products, the impact of complementary foods on nutrition and health, and how milk processing may have affected nutrition content and digestibility of foods. This research on Eurasian pastoralists provides insights into the complexities of weaning among prehistoric pastoral societies as well as the potential for different complementary foods to be incorporated into infant diets in the past. K E Y W O R D S dairy products, life histories, paleodiet, Sintashta, stable isotope analysis 1 | I N T R O D U C T I O N Research on ancient weaning has often focused on agricultural societies with access to domesticated grains, rather than pastoral groups that often lacked cultivars. Our study investigates weaning practices among pastoralists in the Eurasian steppe to determine if unique patterns of weaning are evident when complementary foods focus on ani-mal products rather than domesticated grains. Recent stable isotopic and paleobotanical studies indicate that the pastoral societies under study had a diet based primarily on livestock complemented by wild plants and fauna, but lacking cultivars (Hanks et al., forthcoming; R€ uhl, Herbig, & Stobbe, 2015;Ventresca Miller et al., 2014). We hypothesize that pastoral societies using animal products as the primary complementary food in weaning, rather than domesticated grains, may be Am. J. Phys. Anthropol. 2017; 162: 409-422 wileyonlinelibrary...