The baby cough from time to time to consider for physiological reflex, pathological factors (such as acute bronchitis, allergies) and so on. 1. Physiological reflex: mainly for the baby inhalation of cold air or some of the irritating odor, can stimulate the lungs and the phenomenon of physiological reflex cough; in addition for the little baby, milk overflow or choking, can also appear from time to time cough a sound of the phenomenon, belong to the more normal physiological response, the body does not have any effect. 2. Pathologic factors: (1) acute bronchitis: refers to a variety of pathogens caused by inflammation of the bronchial mucosa, can lead to children with nasal congestion, runny nose, sneezing and coughing and other symptoms. (2) Allergy: If a baby accidentally inhales certain allergens or comes into contact with certain allergens, it can also lead to the phenomenon of over-immune response, which can lead to nasal congestion, sneezing and coughing and other uncomfortable symptoms. There are many other reasons for babies to cough from time to time, it is best to go to the hospital in time to find out the cause of the disease, and then carry out reasonable treatment.