**2. Definition**

Gastroesophageal reflux is a physiological condition that may occur in healthy infants, children, and adults. It usually occurs in very short episodes (<3 minutes) and in the postprandial period without any symptom, esophageal damage, or complications. If these reflux processes cause worrisome symptoms and unwanted conditions, GERD is in question [6, 7].

Regurgitation refers to reflux in the oropharynx, while vomiting refers to the gastric contents coming out of the mouth. There is no need to be with repetition and any coercion. The use of these terms is intertwined in clinical practice, and no definite distinction is made. They are perceived as different states of the same process. Symptoms occur for many reasons (**Table 1**).


#### **Table 1.**

*Differential diagnosis in vomiting infants.*
