The manifestations of pneumonia in one-month-old babies mainly include changes in respiratory rate, cough, fever, poor mental status, digestive symptoms and so on. 1. Changes in respiratory rate: manifested by increased respiratory rate, greater than 60 times per minute, accompanied by wheezing sounds. 2. Cough: it is usually an early symptom of pneumonia. Pneumonia caused by viral and mycoplasma infections may be a dry cough, while pneumonia caused by bacterial infections may be a cough with sputum. 3. Fever: most of the body temperature is 38~39℃, some babies may even have high fever, lasting two to three days, the use of antipyretic medicine is not obvious. 4. Poor mental state: the child may appear depressed, restless, crying or lethargy. 5. Gastrointestinal symptoms: manifested in reduced digestive function, such as decreased appetite, reduced milk intake, choking, etc.. If there are any of the above situations, it is recommended to go to the hospital in time and give corresponding treatment to prevent the symptoms from aggravating and delaying the best treatment period.