新生儿期是人类一生中最特殊阶段,婴儿骤然结束了母体宫内的寄生生活,完全依靠本身微弱的机体去适应自然环境。然而新生儿的免疫系统仍处于继续发育之中,生前在寓内又缺少各种抗原刺激,加上为了维持与母体同存,免疫系统还处在一定程度的抑制状态。因此生后表现出对各种抗原刺激反应很不完善,特别对多种病原微生物显 Neonatal period is the most special stage of human life, the baby suddenly ended the maternal intrauterine parasitism, relying entirely on its own faint body to adapt to the natural environment. However, the newborn’s immune system is still in the process of development. In the past, there was a lack of various antigen stimulation in the apartment. In addition, in order to maintain the coexistence with the mother, the immune system was still in a state of inhibition. Therefore, after birth showed a variety of antigen-stimulating response is not perfect, especially for a variety of pathogenic microorganisms were