A neonatologist prescribes gentamicin for a 2-day-old, septic preterm infant who weighs 4300 grams. The dosage of gentamicin for babies less than 1 week of age is 2 mg/kg q 12 hours. The dose on hand is 20 mg per 1 ml. The nurse calculates the safe dose of this medication to be. ml. in 12 hours.