Pediatric mandibular fractures require treatment that restores occlusion and mandibular continuity while minimizing interference with developing dentition and facial growth. Conservative stabilization is particularly useful when adequate fracture reduction can be achieved without open reduction and internal fixation. We report the management of a 10-year-old female child who presented one day after a fall from a terrace with a left mandibular parasymphysis and body fracture and deranged occlusion. Panoramic radiography and three-dimensional cone-beam computed tomography demonstrated the mandibular fracture pattern. After clinical and radiographic assessment, fracture reduction and occlusal correction were achieved under deep sedation, followed by stabilization using an open cap splint retained with circummandibular wiring. Postoperative medications and routine instructions were provided, and the patient was followed for one month. This case demonstrates the practical use of an open cap splint with circummandibular wiring as a conservative treatment option for mandibular fractures in a child with mixed dentition.