The common reasons why babies don’t catch a cold but cough all the time are as follows: First, due to the poor trachea of babies, they are often infected by pathogenic bacteria that directly invade the bronchi and trachea, causing them to cough, but not sneezing and runny nose are also common. Second, due to the presence of allergic factors, babies are allergic to hot and cold air, or pollen and other stimuli, resulting in coughing and possible wheezing when the child has an allergic reaction. Parents must pay attention to the baby to avoid allergens, or take desensitization treatment if necessary for the baby’s allergy situation. Third, for older babies who do not have cold symptoms but have a cough and do not show any abnormalities in the lung examination and tracheal auscultation, it may be due to neurological factors or pharyngitis and other factors. A detailed diagnosis and further reasonable intervention are needed after detailed examination by the clinician and relevant auxiliary examinations.