Abstract
Teen motherhood is the prevalent childbearing pattern in most traditional societies, as it likely was the case in the ancestral past. Yet teen pregnancy is associated with negative biological and social outcomes in the developed world. This contrast illustrates a question central to evolutionary medicine. How do adaptations to ancestral environments shape contemporary human health and behavior? Teen motherhood also exemplifies the important life history trade-off of whether to invest in current or future reproduction. Should a young teen continue to grow and mature or put her time and energy into starting a family? The age at which a young woman gives birth for the first time is ecologically sensitive to both her physical and social environment. Following an overview of the medical and social risks associated with teen pregnancy, this chapter presents a case study about the Pumé, a group of South American hunter-gatherers, to evaluate the costs and benefits of teen motherhood in a preindustrial environment. Results of demographic analyses show that the youngest of teen mothers (≤14.3 years) have increased risk of infant mortality and lower lifetime fertility compared to older teens. However, young mothers gain no fitness advantage by delaying reproduction past their mid-teens. Cross-cultural comparisons suggest that childrearing practices rather than biological risks explain much of the discrepancy between traditional and developed societies in both the success of and attitudes toward teen motherhood.
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Kramer, K.L. (2017). Evolutionary Perspectives on Teen Motherhood: How Young Is Too Young?. In: Jasienska, G., Sherry, D., Holmes, D. (eds) The Arc of Life. Springer, New York, NY. https://doi.org/10.1007/978-1-4939-4038-7_5
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