Definition of the word spit up

The phrase "spit up" is commonly used to describe a baby's regurgitation of breastmilk or formula. The origin of this term can be traced back to the Middle Ages, where the word "spit" had a broader meaning than just the action of expectorating. During the medieval times, "spit" was used to refer to any liquid that was expelled from the mouth, including saliva, slobber, and vomit. This usage continued into the early modern period, and by the 17th century, "spit" was being used specifically to describe the act of spewing up food. It wasn't until the 19th century that the term "spit up" began to be used in the context of babies. Earlier references to infantile reflux, such as the term "milk sickness," were often associated with symptoms of irritability, crying, and fever. It wasn't until the late 1800s that medical professionals began to recognize the phenomena of gastroesophageal reflux and regurgitation in babies, and the term "spit up" became a more accurate description of this common infantile behavior. Today, "spit up" is a widely understood term used to describe the somewhat unsavory but normal aspect of caring for an infant. It's a reminder that, while caring for a newborn can be a joyous experience, it also comes with its fair share of challenges and messes.