The common reasons why babies cough when they drink milk powder are fast feeding, allergic cough, respiratory tract infection, and so on. 1. milk too fast: such as the pacifier is too large, or the baby due to hunger, or breastfeeding posture is incorrect, resulting in the baby can not swallow in time, the milk powder choking into the trachea, resulting in irritating cough, parents should choose the right pacifier, try not to cry state feeding, pay attention to the breastfeeding posture. 2. Allergic cough: If the baby is allergic to milk powder, it will also cause coughing symptoms, this time is accompanied by rashes, diarrhea and other manifestations, you can choose other kinds of milk powder feeding. 3. Respiratory tract infection: small babies have respiratory tract infection, will also show choking on milk, which can be accompanied by nasal congestion, runny nose, anorexia, crying, shortness of breath and other manifestations, and even fever. In short, when the baby choking on milk powder, such as persistent unrelieved, it is recommended to timely pediatric consultation, clear cause, take targeted treatment.