First of all, it is necessary to clarify the reasons why children often catch colds. Many parents generalize it as low immunity, so we should understand the reasons why children often catch colds and make targeted treatment and diet adjustment. Some children have repeated colds or pneumonia, which are often caused by rickets, improper feeding and too little outdoor activities. Tens of millions of children are calcium deficient or even rickets. Rickets causes children to have repeated colds. Such children should eat more calcium-rich foods, such as bean products, fish and shrimp, kelp and bone soup. And take calcium tablets and cod liver oil when necessary. Some children are anorexic because of zinc deficiency, which leads to malnutrition, anemia and decreased immune function, so they are very prone to catch a cold. Such children should eat more foods rich in zinc, such as walnuts, peanuts and apples. If necessary, they can choose zinc gluconate oral liquid.