Cerebrospinal Fluid Otorrhea--complications Cerebrospinal Fluid Rhinorrhea--complications Child Child, Preschool Chloramphenicol--therapeutic use Drug Therapy, Combination--therapeutic use Female Follow-Up Studies Head Injuries, Closed--complications Humans Infant Male Meningitis, Bacterial--prevention & control Penicillins--therapeutic use Risk Factors Skull Fractures--complications Trimethoprim, Sulfamethoxazole Drug Combination--therapeutic use