Neonatal reflux, also known as gastroesophageal reflux (GER), occurs when stomach contents flow back into the esophagus. This condition is common in newborns and can cause discomfort, feeding issues, and in severe cases, affect growth and development. It is important to distinguish between normal reflux and gastroesophageal reflux disease (GERD), which is a more severe and chronic form of reflux.