A 20-day-old baby with a non-ventilated nose may be suffering from a cold. If it is caused by a cold, you can use a hot towel on the root of the nose, or use a hair dryer to blow hot air on the nostrils. Of course, keep it away from the nostrils and not too close to them. Secondly, the child’s resistance may be lowered by the wind and cold, so the child should drink more hot water or take treatment with Eucerin. While drinking hot water, pay attention to keep the room ventilated and increase and decrease clothing appropriately to avoid catching cold again.