Abstract Using stable isotope analysis of serial samples in permanent first molars, we reconstruct age of weaning and early childhood diets for eight individuals at CA-SJO-112, a 3,000–3,300 cal B.P. site in central California. We compare the results to previously published data from a nearby contemporary site, CA-CCO-548. Data show that, on average, children were weaned earlier at CA-SJO-112, but unlike at CA-CCO-548, boys and girls were eating similar types of foods and overall dietary composition was more homogenous among all children at CA-SJO-112. These differences suggest alternative parental investment strategies at the two sites, perhaps due to greater sharing and communal foraging at CA-SJO-112. Combined with low apparent infant mortality rates and similar rates of stress, as measured by rates of linear enamel hypoplasia, earlier weaning at CA-SJO-112 has important implications for population growth in the region.

中文翻译：

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两个早期阶段的断奶和幼儿饮食：对加利福尼亚中部父母投资和人口增长的影响

摘要 使用恒久第一磨牙系列样品的稳定同位素分析，我们重建了加利福尼亚中部 3,000–3,300 cal BP 地点 CA-SJO-112 中八个人的断奶年龄和幼儿饮食。我们将结果与来自附近当代站点 CA-CCO-548 的先前发布的数据进行比较。数据显示，平均而言，CA-SJO-112 的儿童断奶时间较早，但与 CA-CCO-548 不同的是，男孩和女孩吃的食物类型相似，而且 CA-SJO 的所有儿童的整体膳食成分更同质-112。这些差异表明两个地点的替代父母投资策略，可能是由于 CA-SJO-112 的更多共享和公共觅食。结合低表观婴儿死亡率和类似的压力率，以线性牙釉质发育不全率衡量，