在日常生活中,有些孩子三天两头感冒,尽管应用许多药物,花费很多,但效果却不明显。于是,不少家长就认为这是由于孩子体质差、家庭护理不当或疾病流行所致。据有关专家研究认为,维生素A缺乏也是引起小儿呼吸道感染的因素之一。 维生素A是一种脂溶性物质,具有促进机 In everyday life, some children have a cold for three days, and although it costs a lot of money to use many drugs, the effect is not obvious. As a result, many parents think this is due to poor health, poor home care or disease caused by the epidemic. According to relevant experts believe that lack of vitamin A is also one of the factors that cause respiratory tract infections in children. Vitamin A is a fat-soluble substance, with the promotion of machine