Coughing and phlegm in 2-month-old infants and children may be caused by the following factors: 1, due to colds that are not treated in time, causing inflammation of the trachea, bronchial tubes and other parts of the trachea, which causes coughing and phlegm symptoms. 2, bacteria, viruses and other pathogens directly infected with children’s trachea, bronchial tube mucous membranes, so that inflammation of trachea, bronchial tubes and infections, the children not only coughing and coughing symptoms, may also be accompanied by fever and other symptoms. 3, pediatric pneumonia, the child in addition to coughing, coughing symptoms, accompanied by high fever and breathing difficulties. The child not only coughs and coughs up sputum, but also may have fever and other symptoms. 3, pediatric pneumonia, the child in addition to coughing and coughing up sputum, but also accompanied by high fever and respiratory distress and other symptoms, this situation is more dangerous, if not treated in a timely manner to the child is more harmful. Therefore, when the symptoms of coughing and sputum are obvious, you should bring your child to the pediatrician for further examination and treatment.