Holoprosencephaly (HPE) is a rare congenital brain malformation associated with multiple midline facial defects. This anomaly is resulted from the failure of diverticulation and cleavage of primitive prosencephalon during weeks 4-8 of gestation. HPE is the most common forebrain developmental anomaly in human with the incidence rate of 0.49-1.2 cases per 10,000-20,000 term births. In this study, we described a case of HPE in a neonate with gestational age of 32 weeks. Antenatal ultrasonographic diagnosis was performed, and the infant was presented with macrocephaly, bilateral microphthalmia, hypotelorism, proboscis and ambiguous genitalia.