300
This condition is associated with bilateral cleft lip and palate, microphthalmia or anophthalmia, superficial hemangioma of the forehead or nape of the neck, growth retardation, severe mental retardation, polydactyly of hands and feet, clenching of the fist with the thumb under the fingers, rocker-bottom feet, heart malformations, and several anomalies of the external genitals.
What is Trisomy 13