Ampicillin IV or IM (150 mg/kg per day divided q8) AND either:
Ceftazidime IV or IM (150 mg/kg per day divided q8) or
Gentamicin IV or IM (4 mg/kg per dose q24)
Ceftazidime IV or IM (150 mg/kg per day divided q8) or
Gentamicin IV or IM (4 mg/kg per dose q24)
Ceftriaxone IV or IM (50 mg/kg per dose q24)
Ceftriaxone IV or IM (50 mg/kg per dose q24)
Oral options:
Cephalexin 50-100 mg/kg per day QID or
Cefixime 8 mg/kg QD
Cephalexin 50-100 mg/kg per day QID or
Cefixime 8 mg/kg QD
Ampicillin IV or IM (150 mg/kg per day divided q8) AND either:
Ceftazidime IV or IM (150 mg/kg per day divided q8) or
Gentamicin IV or IM (4 mg/kg per dose q24)
Ceftazidime IV or IM (150 mg/kg per day divided q8) or
Gentamicin IV or IM (4 mg/kg per dose q24)
Ceftriaxone IV or IM (50 mg/kg per dose q24)
Ceftriaxone IV or IM (50 mg/kg per dose q24)
Ampicillin IV or IM (300 mg/kg per day divided q6) AND
Ceftazidime IV or IM (150 mg/kg per day divided q8)
Ampicillin IV or IM (300 mg/kg per day divided q6) AND
Ceftazidime IV or IM (150 mg/kg per day divided q8)
Cephalosporin
Ceftriaxone IV (100 mg/kg QD) or
Ceftazidime IV (150 mg/kg QD)
AND Vancomycin IV (60 mg/kg QD)
Ceftriaxone IV (100 mg/kg QD) or
Ceftazidime IV (150 mg/kg QD)
Pediatric fever of uncertain source
Upper respiratory infection 
AIDS fever of unknown origin
UTI
Lemierre's syndrome
Sepsis
Multisystem inflammatory syndrome in children
Meningitis