Coughing during breastfeeding does not necessarily lead to a decrease in milk, but can be caused by a variety of reasons, some of which can also cause a decrease in milk, as follows: 1. Milk will not decrease: physiological coughs generally do not have any effect on breastfeeding and do not lead to a decrease in milk, such as coughs caused by certain stimulation of the throat or nasal cavity, which have no effect on breastfeeding. 2. 2. Milk reduction: If the cough is caused by infectious diseases, such as common cold, pneumonia or bronchitis, especially if the cough is obvious pus or yellow sputum with fever, it may lead to a reduction in milk production. This is because it leads to loss of body water, which has an impact on milk production. Therefore, if a lactating patient has a significant cough or sputum, or a fever, anti-infective treatment and rehydration and antipyretic treatment should be given actively.