What to Do When a Baby Over 40 Days Old Has Severe Nasal Congestion and Yellow Purulent Nasal Mucus?

The baby is over 40 days old, suffering from severe nasal congestion with yellow purulent mucus, coughing with phlegm in the throat, and a slightly unstable body temperature. After a thorough examination at the hospital, the doctor diagnosed it as bronchial pneumonia. After three days of hospitalization and intravenous fluid therapy, the symptoms have not shown significant relief. How can one confirm whether it’s pneumonia and how many days of fluid therapy are needed for recovery?
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