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[Relations between psycho-physical acceleration and modern obstetrics].

¹Gynäkologisch-geburtshilfliche Abteilung des Städtischen Krankenhauses Lörrach.

Geburtshilfe Und Frauenheilkunde

|October 1, 1990

Summary

Human birth weight and length are increasing in developed nations. Advanced obstetrics enables delivery of larger babies, driving this trend and accelerating human growth.

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Area of Science:

Human biology
Evolutionary medicine

Context:

Observational data indicates increasing human birth weight and length in developed countries.
Existing theories inadequately explain this growth acceleration, often focusing solely on genetics.

Purpose:

To investigate the role of advanced obstetrics in the observed increase of human birth weight and length.
To propose a new hypothesis linking obstetrical interventions to evolutionary selection pressures.

Summary:

Advanced obstetrical techniques (e.g., C-sections, forceps) facilitate the delivery of larger infants, previously limited by high mortality.
This improved survival of larger newborns, potentially driven by selection for larger brain size, increases the frequency of genes promoting greater birth size.
The trend results in taller adults and a higher incidence of necessary C-sections.

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Impact:

Highlights the significant impact of medical advancements on human physical development and evolutionary trajectories.
Suggests a feedback loop where obstetrical interventions influence genetic selection for larger offspring.