It is common for children to catch a cold in daily life. If the cold is not very serious, coupled with the strong resistance of the child, fever may not occur. If the child is seriously cold, coupled with poor resistance, due to exposure to various viruses or bacteria, it is easy to induce respiratory infectious diseases or digestive system infectious diseases, usually, 2-3 days after the fever may occur. If the fever is caused by a respiratory infection, it may be accompanied by nasal congestion, runny nose, sneezing and coughing. If the fever is caused by a digestive system infection, it may be accompanied by abdominal distension, abdominal pain, diarrhea, nausea and vomiting. Parents are advised to bring their children to the doctor in time. Physical cooling, such as fever-reducing patches and warm water wipes, can be used first, followed by medication under the guidance of the doctor. During the treatment period, parents need to pay attention to not let the child too cold or too hot, timely increase or decrease clothing. Diet should be light and easy to digest, such as millet porridge and noodles in clear soup, avoid overeating. Advise the child to pay more attention to rest and develop a regular routine to promote the recovery of the body.