Age/findings	Therapy
Younger than one month	Ampicillin* (100 to 200 mg per kg per day IV or IM divided every six hours) plus gentamicin† (2.5 mg per kg IV or IM every eight hours, with adjustments based on serum levels)57
	Alternative: ampicillin* (100 to 200 mg per kg per day IV or IM divided every six hours) plus cefotaxime (Claforan; 50 mg per kg IV every eight hours)27
Older than one month, urinary findings	Cefotaxime* (50 mg per kg IV every eight hours)
	Alternative: cefixime‡ (Suprax; 8 mg per kg twice on first day, then 8 mg per kg daily)30
One to three months, meningitis not suspected One to three months, meningitis is a concern	Ceftriaxone (Rocephin; 50 mg per kg per day IV or IM divided every 12 to 24 hours)27
	Ceftriaxone (100 mg per kg per day IV or IM divided every 12 to 24 hours)27
One to three months, Listeria or Enterococcus is a concern	Add ampicillin* (100 to 200 mg per kg per day IV or IM divided every six hours) to other antibiotics36
Older than three months, suspected pneumonia	Amoxicillin (80 mg per kg per day divided every eight to 12 hours)
	Alternative: azithromycin (Zithromax; 10 mg per kg orally on day 1, then 5 mg per kg daily for the next four days)27