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出生不久的嬰幼儿由于呼吸道比较狹小,粘膜柔嫩,富于淋巴组织及血管,气管内壁纤毛运动差,肺组织缺乏弹性,肺泡的含气量少而含血量多。这样,呼吸道稍遇感染和炎症,就很容易充血水肿,并为粘膜所堵塞,使狭小的管腔梗塞,加上小儿咳喇无力,又不会吐痰,很容易使炎症向下蔓延形成肺炎。另外,小孩子的自身免疫系统不够完善,而生长发育又很快,如果喂
Infants born soon due to the relatively narrow respiratory tract, mucosal tender, rich in lymphoid tissue and blood vessels, cilia, endotracheal tube movement poor, lack of elasticity of lung tissue, alveolar gas content and blood volume. In this way, respiratory infections and inflammation slightly, it is easy to congestion and edema, and blockage of the mucous membrane, the small lumen infarction, coupled with children coughing weakness, and will not spit, it is easy to make the spread of inflammation down pneumonia . In addition, children’s autoimmune system is not perfect, and rapid growth and development, if you feed