For a 6-month-old baby with a cough, you can try the following methods to relieve your baby’s discomfort: 1. Increase the humidity in the room by using an indoor home humidifier; 2. Use a sea salt water nasal spray, which can be bought in pharmacies or online stores; 3. If there is a lot of snot, use a baby nasal aspirator, which is also relatively easy to buy. Generally speaking, there are some measures to avoid for coughs caused by colds. Because most colds are caused by viral infections, there is no specific medicine for viral infections other than oseltamivir, which is an effective medicine for influenza virus. So any other antiviral methods other than oseltamivir, including the use of ribavirin, vitamin C, any Chinese herbal medicine, proprietary Chinese medicine, and the so-called drinking more water, etc., have no conclusive evidence and can have certain adverse effects instead. The use of over-the-counter cough and cold medicines for children too young to be given is not recommended because the child pays more than the child gets out of the medicine.