新生儿出生时,从一个温暖的温度相对稳定的子宫内环境,转移到一个温度相当波动的子宫外环境。在这新环境中,新生儿须调动体内有关机制,以维持一个适于生存的正常体温。在不同年龄的小儿,其体温调节主要是由 At birth, the newborn is transferred from a relatively stable, warm, intrauterine environment to a rather fluctuating, extrauterine environment. In this new environment, the newborn must mobilize the body’s mechanisms to maintain a normal body temperature suitable for survival. In children of different ages, its thermoregulation is mainly caused by