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American Focus > Blog > Tech and Science > Women’s pelvises are shrinking – how is that changing childbirth?
Tech and Science

Women’s pelvises are shrinking – how is that changing childbirth?

Last updated: June 24, 2025 6:05 pm
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Women’s pelvises are shrinking – how is that changing childbirth?
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Medical Advances and the Evolution of Childbirth

Medical advances have changed childbirth – potentially enough to impact human evolution

FatCamera/Getty Images

A recent study of over 8000 individuals from three countries has revealed a significant decrease in women’s pelvis width over the past century and a half. This trend has sparked a reevaluation of the “obstetrical dilemma,” a concept that describes the conflicting evolutionary pressures on pelvis size related to accommodating large-headed babies and the need for bipedal locomotion.

Research conducted by Maciej Henneberg at the University of Adelaide, Australia, and his team analyzed data from Australian, Polish, and Mexican women spanning different time periods. The findings indicated a consistent decrease in pelvic width over the years, suggesting a potential impact of modern medicine, particularly the prevalence of Caesarean sections, on human pelvic evolution.

According to Philipp Mitteroecker at the University of Vienna, the rise in C-sections is altering the evolutionary dynamics of the human birth canal, leading to narrower pelvises. This shift reflects a broader trend where cultural practices, including midwifery and medical interventions, are influencing biological evolution.

While some experts attribute the narrowing of pelvises to factors like improved nutrition and healthcare rather than evolutionary changes, the implications of this trend on childbirth and maternal health remain a topic of debate. Narrower pelvises may pose challenges for vaginal delivery, potentially increasing the need for C-sections.

Furthermore, the evolving pelvic anatomy raises questions about the obstetrical dilemma and its various influences, including pelvic floor health, walking efficiency, and environmental factors like temperature and physical activity. As childbirth practices continue to evolve, researchers emphasize the complex interplay of genetic, cultural, and environmental factors shaping human childbirth.

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As we navigate these changes, the long-term implications of narrowing pelvises on childbirth and maternal well-being remain uncertain. The ongoing evolution of human physiology in response to medical advancements underscores the intricate relationship between modern healthcare practices and our biological heritage.

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