Where should vaccinations be administered in smaller children?

The correct choice for administering vaccinations in smaller children is the thigh. Specifically, the vastus lateralis muscle of the thigh is recommended for infants and younger children, as it is well-developed, larger, and less likely to contain major nerves or blood vessels compared to other potential injection sites. The thigh muscle allows for volume accommodations for vaccines, making it a safe and effective site for intramuscular injections in this age group.

For larger children and adults, the deltoid muscle in the upper arm is commonly used. However, in smaller children, especially those under three years of age, the deltoid is not fully developed and may not provide enough muscle mass for the complete absorption of vaccines. The ventral gluteal site, which is an option for older children and adults, is not recommended for very young children due to its depth, which increases the risk of injury to the sciatic nerve. The forearm typically is not a site used for vaccinations as it does not have a significant muscle mass, making it less ideal for intramuscular injections.

Choosing the thigh for vaccine administration ensures both safety and effectiveness, adhering to best practices in pediatrics and immunization protocols.