Symptoms of upper respiratory tract infection in infants include fever, upper respiratory kata symptoms such as runny nose, nasal congestion, sneezing, etc. In some patients, it may be accompanied by other manifestations such as coughing, vomiting and diarrhea. Usually the severity of the cold is related to the age of the child and the degree of infection. In infants under 3 months of age, the fever is usually mild or absent, but the symptoms caused by nasal congestion and sneezing are more prominent, such as crying and restlessness, open-mouth respiration, difficulty in sucking, and refusal to breastfeed, which are sometimes accompanied by vomiting and diarrhea. For infants and young children over 3 months old, the systemic symptoms after the cold are relatively heavy, there can be nausea, high fever, and some patients can have convulsions and other phenomena when they have high fever. Nasal congestion, runny nose, cough or sore throat symptoms are usually more serious, also accompanied by vomiting, abdominal pain, diarrhea or constipation and other gastrointestinal symptoms. Infants and young children have low immunity, and if symptoms of upper respiratory tract infection occur, parents are advised to take their children to the pediatrician as soon as possible.