The baby cough cough to spit mucus can be seen in bronchopneumonia, whooping cough and other conditions, there is no question of good or bad, indicating that the cough is more intense need to be actively treated. 1. bronchopneumonia: can be caused by viral or bacterial pathogenic infections, clinical fever, cough or wheezing and other symptoms, with the progress of the disease can be aggravated by coughing, some babies can be because of coughing and vomiting phenomenon, the examination of both lungs auscultation can be detected and wet rhonchi, improve the chest X-ray to assist in the diagnosis, and need to be actively formal treatment. 2. Pertussis: is caused by Bordetella pertussis respiratory infectious disease, the disease duration is longer, in the course of the above phenomenon, often manifested as spasmodic cough, chicken-like inspiratory echoes, some babies can vomit after coughing, or coughing up more mucus and other phenomena, improve the detection of pertussis nucleic acid or pertussis antibody can assist in the diagnosis. This kind of phenomenon does not exist the problem of good or bad, need to actively consult the doctor, the specialist physician according to the condition of the most important to give reasonable and timely treatment.