5-year-old baby coughing at night to consider is due to allergic cough, acute upper respiratory tract infection, cough variant asthma and other factors. 1. allergic cough: the night temperature is lower, 5-year-old baby inhaled cold air, dysfunction will occur, resulting in 5-year-old baby coughing at night, in addition, if the baby is in the environment of dust mites and other allergens, can also trigger this phenomenon. 2. Acute upper respiratory tract infection: most acute upper respiratory tract infections are caused by viral infections, but some are caused by bacteria and other pathogens. After the onset of the disease, 5-year-old babies will have nasal congestion, runny nose, sneezing, dry cough and other symptoms, and cough at night. 3. Cough variant asthma: can also lead to 5-year-old baby cough at night, usually wheezing, cough mainly dry cough, and exercise, cough symptoms will worsen, very few patients will be accompanied by chest tightness, dyspnea and other phenomena. 5-year-old baby coughing at night may also have other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.