It is a relatively common clinical symptom for babies to vomit when they cough. The specific causes are due to the following factors: 1. Because a baby’s cough will cause some irritation to the throat mucosa, the throat mucosa will have a physiological reflex under the effect of stimulation, which leads to the vomiting phenomenon. 2. The baby’s cough will lead to an increase in intra-abdominal pressure at the same time, which makes the food in the gastroesophagus prone to reflux, thus 3. It is more common for babies to vomit when they cough, because they do not cough up phlegm and spit it out in the process of vomiting, which facilitates phlegm discharge. So when the baby coughs up the symptoms of vomiting, parents do not have to worry too much, to closely observe the symptoms of change, if the phenomenon of high fever and depression, the baby should be promptly sent to the hospital for treatment.