宝宝神经系统发育尚未完善,四肢含血量少于内脏,特别是双脚处于肢体末端,离心脏较远,供血相应较少,保温能力弱。在寒冷的冬天,如果对宝宝呵护不周,手脚就更容易受凉,影响健康。手脚受凉降低免疫力宝宝的体温调节中枢不完善,御寒能力差,如果手脚着凉,极易导致全身供血不足,引起鼻、咽、气管等上呼吸道黏膜血管收缩,对病原微生物的抵抗能力降低,潜伏在体内的致病菌便乘机大量生长繁殖,引发呼吸道疾病。宝宝的手脚若长时间受到寒冷和潮湿侵袭,末端小血管处于痉挛性收缩状态,血液流量骤减,皮下组织供血不足,细胞会因缺血、缺氧造成损伤或坏死, Baby nervous system development is not yet complete, blood less limbs than the viscera, especially in the extremities of both feet, away from the heart, the corresponding blood less, poor insulation. In the cold winter, if poor care of the baby, hands and feet are more likely to be cold, affecting health. Cold hands and feet to reduce immunity baby’s body temperature regulation center is not perfect, poor ability to keep warm, if hands and feet cold, easily lead to systemic insufficiency, causing nasal, pharyngeal, tracheal and other upper respiratory tract mucosal vasoconstriction, reduced resistance to pathogenic microorganisms, latent Pathogenic bacteria in the body took the opportunity to take a lot of growth and reproduction, causing respiratory disease. If the baby’s hands and feet for a long time by the invasion of cold and damp, the terminal small blood vessels in the spastic contraction state, blood flow plummeted, subcutaneous tissue insufficiency, cells due to ischemia, hypoxia caused by injury or necrosis,