Baby’s morning and evening cough may be related to respiratory tract infection, variant asthma, gastroesophageal reflux, etc.. 1. Respiratory infections: if the baby has respiratory infections, the vagus nerve is easily excited at night, which will lead to bronchial smooth muscle spasm, triggering a cough in the evening; and in the morning due to the low temperature or the respiratory tract of the phlegm is too much, but also easy to cough. 2. Cough variant asthma: often occurring at night or early morning episodes of cough, mostly aggravated after exercise, sputum less. 3. Gastroesophageal reflux: If the baby is overfed or has poor absorption of calcium and vitamin D, it is easy to lead to softening of the laryngeal cartilage, which is prone to gastroesophageal reflux. When the baby is lying down, the stomach contents will reflux to the throat, stimulate the throat to cause coughing, also accompanied by nausea, heartburn and other symptoms. 4. Postnasal drip syndrome: If the baby has nasal cavity, sinus, nasopharynx and other diseases, its secretions can flow into the throat through the posterior nostril, and even into the airway, stimulating the airway to cause cough. Morning and evening when lying down will generally aggravate, but during the day is not easy to stimulate the airway or cough less, generally not easy to cause parental concern. If your baby has a cough in the morning and evening, you should consult a doctor for examination and treatment to relieve the symptoms of coughing in the morning and evening as soon as possible, so as not to delay the condition.