Monosomy 5p, also known as Cri du chat syndrome, is a rare autosomal deletion syndrome characterized by a mewing cry (cri du chat) in infancy, multiple congenital anomalies, intellectual disability, microcephaly, and facial dysmorphism.

Facial height (length) is more than 2 standard deviations above the mean (objective); or, an apparent increase in the height (length) of the face (subjective).