Drug	Age/birth weight	Dosage*
Ampicillin, IM, IV	<1 week of age: <2,000 g	50 mg per kg per dose, every 12 hours
	<1 week of age: >2,000 g	50 mg per kg per dose, every eight hours
	>1 week of age: <2,000 g	50 mg per kg per dose, every eight hours
	>1 week of age: >2,000 g	50 mg per kg per dose, every six hours
Gentamicin (Garamycin),† IV, IM	≥34 weeks	4 mg per kg per dose, every 24 hours
	28 to 34 weeks	3 mg per kg per dose, every 24 hours
	<28 weeks	2.5 mg per kg per dose, every 24 hours
Ceftriaxone (Rocephin),‡ IV, IM	§	50 mg per kg per dose, every 24 hours