How long your baby needs to be treated for severe pneumonia depends on the specific circumstances, as follows: 1. It is closely related to the clinical manifestations of pneumonia and the presence of complications, etc. Respiratory distress is severe in severe pneumonia, but it may be relieved within 1 week after general treatment such as anti-inflammatory, anti-infective, immune-supportive therapy, and oxygen. If the child has more significant complications, such as an abscess chest or pneumothorax, the treatment time is longer. In severe pneumonia with mechanical ventilation, the treatment time may be extended. 2, the pathogen is different, the course of treatment is not the same, streptococcal pneumonia, even if it is severe, but no other conditions arise, the possible course of treatment is about 10 days to half a month. If the pneumonia is caused by Staphylococcus aureus may take a long time. Even more than 20 days to a month, if there are complications, severe pneumonia treatment will take longer.