Introduction: The facial fractures in pediatric patients are rare, and they need an immediate treatment to recover the function and aesthetic to the young patients. Anatomic reduction along with rigid skeletal stabilization is mandatory until bone union has occurred. Special consideration about variation in anatomy and physiology of pediatric patients, as well as the particular stage of growth and dental development should be preferred. Case report: We present a case of 5 year old girl patient with fractures of the parasymphyseal and left angle of mandible horizontally and vertically unfavourable, with significant displacement and huge lacerated wound of the face caused by machete slashed. We successfully managed the pediatric complex mandible fractures by performing open reduction internal fixation using resorbable miniplates and gunning splint as intermaxillary fixation. Conclusion: Pediatric mandible fractures requiring ORIF are rare. The combination of intermaxillary fixation and resorbable fixation system is needed postoperatively because of the extensive fractures for adequate fixation and good outcomes.