An infant who appears to be of normal size is noted to be lethargic and somewhat limp on the warmer after birth. The mother is 28 years old, and this is her fourth delivery. The pregnancy was uncomplicated, with normal fetal monitoring prior to delivery. Labor was rapid, with local anesthesia and intravenous meperidine (Demerol) administered for maternal pain control. Which of the following therapeutic maneuvers is likely to improve this infant’s condition most rapidly?