A rare congenital abnormality consisting of prenatal mandibular hypoplasia, resulting in a sequential triad of micrognathia, glossoptosis, and cleft palate present at birth. The term Pierre-Robin sequence refers to this condition in isolation. The tongue may prolapse backward, causing life-threatening apnea or airway obstruction. Abnormalities may cause difficulty feeding and failure to thrive. Most commonly caused by an autosomal dominant mutation on gene SOX9, but often the result of a new mutation. In some cases, the mandibular will develop into a normal size. Management consists of mitigating airway obstruction.

Pierre-Robin sequence may occur with other abnormalities, including Stickler syndrome, velocardiofacial syndrome, or camptomelic dysplasia. These combined conditions are referred to as Pierre-Robin syndrome and may be significantly more life-threatening.