BackgroundThe external ear consists of the auricle/pinna and external auditory canal. The auricle development begins between the 5th and 9th weeks of gestation from six auricular hillocks derived from the first and second pharyngeal arches. By 13th–14th weeks the hillocks fuse to complete the development of the auricle, which reaches its final position by week 20. Information of the auricle’s morphology and anthropometry during the fetal period is limited. This study aimed to describe the normal anthropometric development of the fetal auricle to establish reference values for gestational weeks 11th–28th.A cross-sectional study was conducted on 202 auricles from 101 fetuses. Gestational age was determined by anthropometry. Eight parameters were measured in each auricle following a standardization procedure performed on 60 auricles, obtaining high intra- and inter-observer reliability (intraclass correlation coefficient, ICC > 0.90 and > 0.80 respectively). Measures were compared by gestational age periods, auricular laterality, and sex.ResultsStatistical analysis revealed significant growth differences (p < 0.05), between 15th–16th and 17th–18th weeks for most of the measurements, except for the left conchal length. No significant differences were found between right and left auricles nor between sexes.ConclusionsThese findings provide valuable data for fetal facial development and to support the diagnosis of auricular developmental anomalies.