The reasons why babies still spit up after eating milk for a long time include physiological factors, which are related to improper parental care, and pathological factors, such as indigestion and intestinal obstruction. 1. Physiological factors: due to the anatomical structure of the baby’s stomach is relatively straight, the cardia sphincter muscle is loose, when the baby has been eating milk for a long time, if the parents hold the baby in an incorrect position or the head is a little low, the above symptoms will easily appear. 2. Pathologic factors: (1)Indigestion: as the digestive function of infants is relatively weak, when they catch a cold or have an unreasonable diet, they may suffer from indigestion and show the above symptoms. (2) Intestinal obstruction: Because infants suffer from intestinal obstruction, the milk cannot be emptied smoothly after feeding and stays in the stomach for a long time, which induces the above symptoms. There may be other reasons why babies still spit up after feeding for a long time, so it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or therapy under the guidance of the doctor.