Coughing in the second half of the night may be caused by gastroesophageal reflux, dry air and respiratory infections. 1. Gastroesophageal reflux: feeding your baby formula or breast milk in the middle of the night may cause food to reflux and irritate the throat, which will lead to coughing in the middle of the night. 2. Dry air: indoor air is too dry in the second half of the night, the baby’s throat will be dry, there will be baby cough symptoms, you can place a humidifier in the room to regulate indoor humidity. 3. Respiratory tract infection: the baby sleeps without a good blanket, may lead to cold caused by respiratory tract infection, there will be the symptoms of the second half of the night cough. Baby cough in the second half of the night may also be related to other factors (such as cough variant asthma), if not relieved, parents should take their children to the hospital in time for examination and treatment under the guidance of the doctor.