Prenatal gender-customized head circumference nomograms result in reclassification of microcephaly and macrocephaly.

Background: Local and worldwide prenatal charts for estimated fetal weight and postnatal charts for head circumference are gender specific. However, prenatal head circumference nomograms are not gender customized.

Objective: This study aimed to create gender-customized curves to assess between-gender head circumference differences and to study the clinical significance of using such gender-customized curves.