In 2013, Sekiya et al. described the discovery of a juvenile individual which was assigned to what the authors termed "Yunnanosaurus robustus". Specimen ZMNH-M8739 consists of partial cranial material and an almost complete post-cranial skeleton. This individual possesses characteristic dentition that suggests a potentially unique feeding mechanism as evidenced a tooth–tooth wear facet on its mesial maxillary and dentary teeth, and maxillary teeth that have coarse serrations. Comparison of this juvenile specimen with adult specimens of "Yunnanosaurus huangi" reveals very distinctive growth changes.