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Keywords:

  • primates;
  • parturition;
  • cephalo-pelvic relationships;
  • encephalization;
  • neonatal development

Abstract

A review of recent studies of cephalo-pelvic relationships in primates at birth reveal that body size is the primary determinant of cranial dimensions at term. Variation in intraordinal size relationships are used to predict the course of labor, and nonintrusive observational studies are required to test these predictions.