護理師準備對嬰兒進行肌肉注射。請問下列哪個部位最適合？

嬰兒肌肉注射的首選部位為股外側肌（Vastus lateralis）。此部位肌肉發育最為成熟，且遠離主要的血管與神經束，能大幅降低注射損傷的風險。對於尚未學步的嬰兒，三角肌發育不足，而臀部肌肉注射若位置錯誤極易傷及坐骨神經。進行肌肉注射時，護理師應評估肌肉厚度，並確保使用適合嬰兒長度的針頭，以達到安全給藥之目的。

The vastus lateralis muscle is the preferred site for intramuscular injections in infants because it is well-developed and located away from major nerves and blood vessels, minimizing injury risk. The dorsogluteal site is contraindicated due to the danger of sciatic nerve damage, and the deltoid is often too small in infants to safely accommodate the injection.