Why do babies get shots in their legs?

Babies receive shots in their legs primarily because the vast muscle tissue in the thigh provides a safe and effective site for intramuscular injections. This area can accommodate the volume of the vaccine and allows for better absorption. Additionally, the thigh muscles are less likely to be affected by nerve endings, reducing discomfort for the baby during vaccinations. Vaccinating in the leg also helps ensure that the upper arm, which is used for later vaccinations in childhood, remains free for future shots.