Where should a nurse administer an intramuscular injection to a 2-month-old infant?

The vastus lateralis site is the preferred location for administering intramuscular injections in a 2-month-old infant due to its size and accessibility. In infants, the muscle mass in the vastus lateralis is well developed and provides a safe and effective location for injections. This muscle is located on the outer thigh, and because it is farther from major nerves and blood vessels, it minimizes the risk of injury during the injection process.

Using the dorsogluteal site is not recommended for infants due to the potential for injury to the sciatic nerve and the underdevelopment of muscle mass in this area at such a young age. The deltoid muscle may not be sufficiently developed in infants for safe use; therefore, it is typically avoided until the child is older. The rectus femoris, while a possible site, is less commonly used than the vastus lateralis because it may lead to discomfort and is not as easily accessible in infants. Thus, the vastus lateralis offers the best combination of safety and efficacy for intramuscular injections in this age group.