The occasional dry cough of a 20-day-old newborn is usually not serious, and may be related to the child choking on milk, indoor dryness, dust stimulation, and so on. Newborns to the outside air of the hot and cold changes, changes in humidity is more uncomfortable, or have a special smell, will stimulate the nasal cavity of newborns, resulting in respiratory mucosa mild congestion, edema, thus causing a dry cough. If the symptoms are relatively mild, by strengthening the warmth, increase humidity, the symptoms can usually be relieved on their own, without special treatment. However, it is important to pay attention to whether the newborn has any other accompanying symptoms when he has a dry cough, such as whether there is a whistling sound in his throat and whether his body temperature is normal, etc. If there are abnormal symptoms, he should be treated immediately. If there are abnormal symptoms, you should go to the hospital immediately and take symptomatic treatment. Newborn resistance is poor, the immune system is not yet well developed, so parents pay attention to the baby to add clothing, to prevent cold and wind. Usually pay more attention to regular cleaning clothes, keep indoor temperature and humidity appropriate.