Babies always cough at night can be caused by upper respiratory tract infections, cough variant asthma, or other causes. Babies cough at night, commonly due to upper respiratory tract infections, the disease can lead to symptoms of a runny nose, when lying down at night when the nose is more likely to backflow and coughing symptoms occur. Coughing at night can also be caused by cough variant asthma, which can lead to coughing at night or early in the morning. There are other causes of nighttime coughing, such as gastroesophageal reflux or cardiac insufficiency, which can lead to worsening of the cough at night. Therefore, it is important to consult a doctor to assess the cause of the cough in conjunction with the other features of the cough, and to target the treatment.