Cough with sputum is a more common symptom in 3-month-old babies, which is commonly associated with respiratory tract infections. Whether it is pneumonia or not should be judged in conjunction with the severity of respiratory symptoms, lung signs and chest X-ray.
For 3-month-old babies, cough with sputum is most commonly seen in respiratory tract infections, such as acute upper respiratory tract infection, acute bronchitis or bronchopneumonia. Most of them are caused by pathogens such as viruses or bacteria.
Whether it is pneumonia, need to comprehensive judgment and assessment, such as the baby cough with sputum, and into progressive aggravation, may be accompanied by wheezing, fever, lung examination can be heard in both lungs of the wet rhonchi, or improve the chest X-ray can be seen patches of exudate shadows, etc., can be diagnosed as pneumonia, need to be actively consulted for treatment.
In acute upper respiratory tract infections, babies may also have the above symptoms, usually with mild coughing symptoms, without progressive aggravation, accompanied by fever, runny nose or nasal congestion, etc., with no obvious abnormality in the lung signs, and basically normal chest X-ray.
It is recommended to consult a specialist for a comprehensive assessment and judgment.