Children with phlegm in the throat accompanied by a low fever may be suffering from pneumonia or laryngitis. 1. Pneumonia is an acute and chronic non-specific inflammation of the bronchial mucosa and surrounding tissues caused by biologic or non-biologic factors. Pathogenic microorganisms include viruses, bacteria, mycoplasma, chlamydia, fungi and other infections. Non-microbial factors may be due to seasonal changes, exposure to cold air or irritant gases, dust, smoke inhalation and other factors can lead to tracheal mucosal damage and inflammatory response, cough, cough sputum, fever and other symptoms. 2. Laryngitis is due to bacterial or viral and environmental factors such as inflammation of the laryngeal mucosa, often secondary to upper respiratory tract infections, pathogenic microbial infections can be caused by coughing, coughing up sputum, fever, can be accompanied by throat itching or pain symptoms. Clinically, there are many reasons for babies to have phlegm in the throat accompanied by a low fever, and if you feel unwell, it is recommended that you consult a doctor in time to find the cause of the problem and seek targeted treatment.