護理師準備為嬰兒進行肌肉注射，首選部位為何？

嬰兒的肌肉組織發育尚未完全，選擇注射部位時必須考慮安全與吸收效率。股外側肌（vastus lateralis）位於大腿外側，該處肌肉厚實且遠離大型神經與血管，是嬰兒肌肉注射的首選部位。臀部肌肉（如背臀肌）因嬰兒尚未開始行走，缺乏足夠的肌肉量，且容易誤傷坐骨神經，因此禁止使用。三角肌在嬰兒時期肌肉量太小，無法承受藥物注射量，故不適合作為首選。

An infant's muscle tissue is not fully developed; selecting an injection site must account for safety and absorption efficiency. The vastus lateralis muscle, located on the outer thigh, has thick muscle bulk and is distant from major nerves and vessels, making it the preferred site for intramuscular injection in infants. Gluteal muscles (such as the dorsogluteal) lack adequate muscle mass because infants have not yet begun to walk, and these sites also risk injury to the sciatic nerve, so they are contraindicated. The deltoid muscle is too small in infancy to accommodate medication volumes, so it is not preferred.