Baby cough and low fever is not necessarily pneumonia, but may also be caused by upper respiratory tract infection, tuberculosis and other diseases. 1. Pneumonia: Pneumonia is caused by bacterial, viral and other pathogenic infections, patients will have cough, fever, shortness of breath, fatigue and other symptoms. Therefore, babies with pneumonia will have cough and low-grade fever. 2. Upper respiratory tract infection: Upper respiratory tract infection is mainly caused by pathogen infection, such as bacteria or viruses. Patients with upper respiratory tract infections may also have a cough, low-grade fever, accompanied by a runny nose, sneezing and other symptoms. 3. Tuberculosis: Tuberculosis is mainly caused by Mycobacterium tuberculosis infection, the patient’s main symptoms are dry cough, chest pain, low fever and so on. Baby cough and low fever may also have other causes, such as bronchitis, it is recommended to go to the hospital in time to improve the examination to clarify the cause of the disease, give targeted treatment or treatment.