Bronchiectasis in newborns can be diagnosed based on clinical manifestations combined with relevant examinations, specifically the following tests are required: 1. Relevant laboratory tests: total white blood cell count is mostly normal, but in acute episodes of concurrent bacterial infection, total white blood cell count and neutrophils are seen to be elevated, and in combined coughing and wheezing, routine blood tests suggest that eosinophils can be increased; 2. Chest X-ray: occasionally, lung shadows are seen to deepen, and in early stages there can be no obvious Changes, recurrent acute attackers can be seen in both lung texture thickening, lung shadow obvious. If wet rales or twisted sounds are heard, pneumonia should be considered for chest X-ray to confirm the diagnosis; 3, pulmonary function tests: when small airway obstruction, the maximum expiratory flow rate – volume curve at 75% and 50% of the lung volume can be significantly reduced, and the closed volume can be increased.