1. Definition and overview of pneumonia in babies Pneumonia refers to a disease caused by lung infection and is one of the important life-threatening diseases. Children are susceptible to infection due to their weak immunity, especially pneumonia during the cold season. Early diagnosis and treatment of pneumonia in babies is very important. 2. Common symptoms of pneumonia in babies 1. Fever: After a baby is infected with lung bacteria or other microorganisms, the body will produce a large number of antibodies to fight the bacteria, and fever will occur at this time. 2.