Cesarean births act as a medical intervention that buffers natural selection against obstructed labor, thereby allowing genetic traits associated with fetopelvic disproportion to be passed down and actively influencing human evolutionary trajectories.
The claim is specific, empirical, and testable regarding whether medical intervention in childbirth alters human evolution. Papers [0] and [3] explicitly discuss how the regular use of cesarean delivery bypasses the fatal outcomes of cephalopelvic disproportion, thereby altering selection pressures and driving ongoing evolutionary changes in human reproductive anatomy. The remaining papers focus on related topics such as the obstetrical dilemma, maternal mortality, and pelvic measurements without directly evaluating the evolutionary impact of C-sections. Therefore, the evidence firmly supports the claim.