Half a year old baby cold, nasal congestion, if not particularly serious, you can drink some warm water, wear a little thicker clothes, so that cold, nasal congestion will have appropriate relief. If the symptoms are a little more serious, you can take some proprietary Chinese medicine, such as pediatric antisense particles or pediatric pharyngeal flatus particles, which can also relieve the symptoms. Some children, if the nasal congestion is particularly obvious, affecting milk or sleep, can also apply ephedrine drops to the nasal cavity, which can reduce the congestion and edema of the nasal capillaries, and can quickly relieve the child’s nasal congestion symptoms. Some children may have allergic conditions, some children may have eczema or have allergic rhinitis in the family, or their parents have these diseases, he may also have colds, nasal congestion when these allergic symptoms, you can give him some cetirizine or phenylephrine can be relieved.