The causes of coughing in a two-week-old child can be broadly divided into: first, coughing due to infectious factors, such as bacterial infections, which are more common: 1. Bacterial infections such as Streptococcus pneumoniae, Haemophilus influenzae, Staphylococcus, and Escherichia coli can cause bronchitis or bronchopneumonia manifesting as coughing; 2. Viral infections, the most common of which are adenovirus infections, respiratory syncytial virus infections, influenza virus infections, measles virus infections, etc. 3. 3. fungal infections can cause cough in children, the more common ones being Candida albicans, Aspergillus, Sporotrichia and so on. More common recent ones are mycoplasma infections that cause coughs in children and chlamydia infections that cause coughs in children. Secondly, non-infectious factors cause cough in children, such as allergic cough, cough variant asthma, etc. Therefore, when a two-week-old baby develops a cough, it is important to distinguish which factor is causing the cough according to the cough and the accompanying symptoms, and then treat it according to the cause.