If your one-year-old child is coughing, has a runny nose, and a slight fever, you can try using a combination of Helixia™ and Tempra™. However, it is usually more effective to reduce the amount of mucus in their nose by using a technique like the one described in the document provided. This may also help reduce the fever if it is caused by viruses and mucus in their nose. If the fever persists for more than three days despite using the technique, it is important to consult a doctor.