Posseting is a common phenomenon in infants, characterized by the involuntary regurgitation of milk after feeding. While the term posseting is widely used, there are several other synonyms that can be used interchangeably such as spitting up, reflux, regurgitation, vomiting, and burping. Spitting up refers to a small amount of milk that is expelled from the mouth, while reflux is the backflow of stomach acid into the esophagus. Regurgitation refers to the expulsion of undigested food from the mouth or esophagus, while vomiting is the forceful ejection of stomach contents. Burping is the release of gas from the stomach through the mouth. All these terms are used to describe the same phenomenon and can be used to better understand infant feeding patterns and behavior.