Children with colds and coughs can be seen in the infected cough, lower respiratory tract infections, etc., need to be analyzed according to their specific circumstances. 1. Cough after infection: viral infection caused by acute upper respiratory tract infection, commonly known as “cold”, in the improvement of the disease, there can still be a cough, usually no progressive exacerbation, and coughing symptoms are mild, improve the chest X-ray examination is normal, this kind of cough is more than 4-8 weeks to heal, during the period of time need to pay attention to the prevention of re-infection. 2. Lower respiratory tract infections: such as acute bronchitis, bronchopneumonia, in the early stage of the disease may appear “cold” symptoms, such as nasal congestion, runny nose, and so on, and then cough, and cough as the main symptom, showing progressive aggravation, double lung examination and chest X-ray examination can help diagnosis. It is necessary to actively seek medical treatment to avoid aggravation of the condition. When a child has a cough after a cold, it is recommended that he or she be seen by a specialist for evaluation and judgment.