In newborns with imperfect gastrointestinal development, flatulence may last for about 2 to 3 months, flatulence caused by overeating may last for a few days, and chronic gastroenteritis that is not treated in a timely manner may also occur for a long time. Each patient’s condition varies and it is not possible to say definitively how many days the flatulence lasts. In the case of newborns, due to the imperfect function of the gastrointestinal tract and insufficient secretion of digestive enzymes, it is not easy to digest after eating milk, and intestinal flatulence will recur, which is physiologic and may last for about 2 to 3 months, with the well-developed ones lasting for a shorter period of time, and the slow-developing ones for a longer period of time. When too much food is eaten at one time, the food is digested slowly and the accumulation of gas produces intestinal flatulence, which can be relieved after the food is digested and absorbed for a few days. If there are chronic gastroenteritis and other diseases, slow gastrointestinal peristalsis, not timely treatment, may also appear intestinal flatulence for a long time, the time is not certain. Babies with intestinal flatulence to exclude imperfect development and other physiological reasons, may also be other reasons such as intestinal obstruction, etc., should be timely consultation, under the guidance of the doctor to identify the causes, and reasonable treatment.