Bronchitis is an inflammation of the mucus membrane lining the bronchi. Bronchitis in children is a benign pathology and progresses over a few days. In children, the cough is dry at the beginning and will become more moist in a few days. The presence of mucus in the airways will generate sputum or phlegm: coughing in this context is a physiological phenomenon to enable the elimination of mucus, a thick substance that can slightly interfere with breathing: we must respect this cough, and syrups against cough are not necessary. Bronchitis is usually viral and passes spontaneously.