Pneumonia is an inflammatory lung condition common in children. It is caused by viruses like RSV or bacteria like Streptococcus. Symptoms include fever, cough, rapid breathing. Risk factors include low birth weight, malnutrition, and exposure to pollution or smoking. Diagnosis involves physical exam, chest x-ray, and tests for bacterial/viral infection. Treatment depends on the cause but involves antibiotics, oxygen, fever control and nutrition. Prognosis depends on the child's health and type of pneumonia. With proper treatment, most make a full recovery.