Whether a 2-month-old baby coughing and spitting up bubbles is pneumonia or not needs to be diagnosed based on various aspects such as clinical manifestations, signs and auxiliary examinations, etc. It is recommended to go to the hospital to avoid blind diagnosis and treatment. Pneumonia in 2-month-old babies usually shows fever, accelerated breathing, coughing, choking, etc., accompanied by the above-mentioned symptoms of spitting up bubbles, and in severe cases, wheezing and dyspnea may occur. Doctor’s lung auscultation can be heard wet rhonchi; auxiliary tests include chest X-ray, blood tests, lung ultrasound, etc. After definitive diagnosis, it is also necessary to do the examination of the type of pathogenic bacteria, etc. However, it is not just based on the 2-month-old baby coughing and spitting bubbles can be diagnosed as pneumonia, the need for timely consultation, under the guidance of the doctor to carry out detailed examination and treatment, to avoid delays in the condition. Parents are advised to strengthen the daily care of their babies and seek medical attention as soon as possible when abnormalities are detected to ensure accurate diagnosis and safe treatment.