Asthma symptoms in babies are mainly coughing, wheezing, shortness of breath and chest tightness, mostly occurring at night or in the morning when waking up or when there is a change in the external environment, when asthma suddenly worsens or suddenly attacks on the basis of no symptoms. There are many causes of asthma in babies, such as allergies, infections, sports, seasonal changes and exposure to cold air, which can lead to sudden onset or aggravation of coughing and wheezing, which can be improved by medication, but can come back after stopping medication. The precursors and early stages of attacks are when babies are stimulated by cold air or other allergic factors, they usually first show symptoms of upper respiratory tract allergy, such as itchy eyes, itchy nose, sneezing and runny nose. Since babies are too young to describe them, they only show them by rubbing their eyes and rubbing their nose. Severe cases may manifest as itchy palate, itchy throat, dry cough and choking cough. In a typical attack, there is a pronounced prolongation of the expiratory phase, and a wheezing sound can be heard on auscultation, even without a stethoscope in severe cases. There are also signs of increased respiratory frequency, dyspnea, open-mouth breathing, and nasal flapping. Many children also have cough and sputum. Severe cases may show irritability, cyanosis, pallor, and cold sweat. In remission, babies with asthma may have no signs and symptoms, no effect on activities, and some may have chest tightness.