The nurse is administering an intramuscular injection of an antibiotic to a 3-month-old infant. Which would be the best site for the nurse to give this medication?

Choice A reason: The vastus lateralis is the preferred site for IM injections in infants, as it is well-developed, has minimal nerves and vessels, and accommodates safe volumes. This aligns with pediatric nursing injection guidelines, making it the best choice for a 3-month-old receiving an antibiotic intramuscularly. Choice B reason: The deltoid muscle is underdeveloped in a 3-month-old, with insufficient muscle mass for safe IM injections. The vastus lateralis is safer and more developed, making this incorrect, as the deltoid risks injury or inadequate drug absorption in infants receiving intramuscular injections. Choice C reason: The dorsogluteal muscle is avoided in infants due to proximity to the sciatic nerve and underdeveloped gluteal mass, risking nerve damage. The vastus lateralis is safer, making this incorrect for a 3-month-old, as it poses significant safety concerns for IM antibiotic injections. Choice D reason: The ventrogluteal muscle is safe in older children but less accessible in infants due to small muscle mass and positioning challenges. The vastus lateralis is preferred for its accessibility and safety, making this incorrect for a 3-month-old’s IM antibiotic injection in clinical practice.