4-year-old baby will cough at night may be caused by improper diet gastroesophageal reflux, at this time there is no need to take medication, improve dietary habits can be relieved. May also be due to bronchitis, allergic cough, etc., can take general treatment, medication and so on. 1. Gastroesophageal reflux: If a 4-year-old baby is accustomed to eating too much at night, it is easy to cause food reflux after lying down due to the change of position, which stimulates the pharynx and coughs, so it can be relieved by changing dietary habits and not eating too much at night. 2. Bronchitis: common manifestations of coughing, coughing up sputum, some patients with fever, wheezing and so on. In addition to a light diet, avoid cold and other general care, more need to use medication. If viral infection is mainly symptomatic treatment, if accompanied by phlegm mucus, can use aminobromine nebulization treatment. For bacterial infections, amoxicillin and other anti-infective treatments can be used. 3. Allergic cough: typical symptoms are paroxysmal cough, mainly dry cough, occasionally with little sputum, no fever and other symptoms, often aggravated after exercise and emotional excitement. Need to stay away from allergens, if necessary, can use loratadine and other anti-allergy treatment. 4-year-old baby will cough at night, there are other reasons, such as sinusitis, etc., it is recommended to consult a doctor in a timely manner, to identify the cause of the cause of treatment, the above medication as prescribed by the doctor.