We report a rare case of a boy with median clefts of the lower lip and mandible. In addition, there was a fibrous band extending from the symphysis of the mandible to the suprasternal notch. We repaired the mandibular cleft using autologous iliac bone grafts. The separated mandibular bones were reconnected by rigid fixation with titanium miniplates. Z-plasty with cervical skin was also performed. The fibrous band extending from the mandibular symphysis to the suprasternal notch was dissected. The suprasternal notch end of the band was cut off, and a fibrous soft-tissue pedicled superior flap was formed. The flap was turned over and transferred to the mental region subcutaneously to correct the microgenia. The appearance of this child was greatly improved by this procedure.