Burping after drinking milk is usually a normal phenomenon, and it is a physiological phenomenon that occurs in many people, mostly due to poor drinking habits. In most cases, there are several causes: 1) poor eating habits, as drinking milk while talking is likely to lead to hiccups; 2) hiccups caused by drinking milk too quickly; 3) drinking a lot of milk leading to being too full, while inhaling a lot of air during the drinking process; 4) drinking cold or very hot milk can lead to hiccups. All of the above causes can lead to a sudden rise in abdominal pressure, which causes the diaphragm to expand and contract, resulting in a sound that can be short or long when the vocal chambers close during inhalation.