Naloxone (Narcan) is a specific opiate antagonist that can reverse respiratory depression in newborn infants that may be due to transplacentally acquired opiates. It can be given intravenously, intramuscularly, intraosseously or subcutaneously. The recommended dose is 100 microgram/kg.

Choice B is wrong because nalbuphine (Nubain) is a mixed opiate agonist-antagonist that can cause respiratory depression and withdrawal symptoms in opioid-dependent mothers and infants.

Choice C is wrong because butorphanol (Stadol) is another mixed opiate agonist-antagonist that can have similar effects as nalbuphine.

Choice D is wrong because fentanyl (Sublimaze) is a synthetic opioid that can cause respiratory depression and sedation in both mothers and infants.

Normal ranges for respiratory rate in newborn infants are 30 to 60 breaths per minute.

Normal ranges for oxygen saturation in newborn infants are 90% to 100%.