Parent-Offspring Conflict Evident in Cephalization Index of Newborn Exposed to Cortisol

High cephalization index (CI) in newborns indicates disrupted fetal development. We hypothesize high levels of cortisol late gestation and early first menarche correlate with higher CI. We found no support. Cortisol could serve as a cue for the fetus to use stronger support tactics or genomic imprinting is at play.