Children coughing white sputum into yellow sputum can be caused by bronchitis, pneumonia and other diseases. 1. Bronchitis: the occurrence of bronchial is usually associated with pathogen infection, chemical stimulation, physical stimulation, allergies and other factors, the main symptoms are coughing up sputum, coughing, wheezing, etc., when the condition is mild, usually white mucus or plasma foam sputum, with the aggravation of the infection and the progression of the disease, it can be changed from white sputum to yellow sputum. 2. Pneumonia: Bacterial infections, viral infections, fungal infections, immune damage and physical and chemical stimuli and other factors can trigger pneumonia, fever, chills and muscle aches and pains and other manifestations, but also accompanied by coughing and coughing white sputum and other symptoms, sputum can be yellow with the development of the disease. When your child’s cough turns from yellow sputum to white sputum, you should consult a doctor in a timely manner. Active treatment under the guidance of a specialized doctor can help alleviate the uncomfortable symptoms.