Acute respiratory tract infections are one of the leading causes of death in infants under the age of five worldwide, accounting for 16% of infants under 5 years old who pass away in India. The most frequent lower respiratory tract illness in children under two is acute bronchiolitis, which accounts for two out of every 100 infant hospitalizations. Symptoms include acute inflammation, edema, necrosis of the epithelial cells lining the tiny airways, and increased mucus secretion. The history and clinical examination are the primary bases for diagnosis and severity rating, and the illness is typically self-limiting and lasts 3 to 7 days. Pulse oximetry was used to assess saturation at admission, and the Emergency Department's SpO2 measurement was the greatest predictor of respiratory distress. Demographic information, exam information, and history were gathered and entered into a proforma that had been specially created for the research. Corrected gestational age was taken into account for the infants who were delivered prematurely. This research examined the need and duration of oxygen supplementation IVF requirement in 70 infants admitted with acute bronchiolitis to the paediatric section of the KMC in Manipal. Out of 70 infants, 29 (41.4%) were female and 41 (58.6%) were male. 1 month to 6 months was the most prevalent age range (60%) engaged, and 17 (24%) of the 70 kids had atopy in the family. Males were more likely to be affected than females in the less than six-month-old age category, and there was a spike in instances from August to November. Common symptoms at presentation were cough, feeding difficulty, and iron deficiency anemia

Keywords : Oxygen Saturation, Acute Bronchitis, Emergency Department, Admission, Infants.