Acid reflux occurs when the sphincter muscle at the lower end of your esophagus relaxes at the wrong time, allowing stomach acid to back up into your esophagus this can cause heartburn and other signs and symptoms frequent or constant reflux can lead to gastroesophageal reflux disease (gerd). Grade acid reflux. Reflux, or regurgitation, is common in infants and peaks between 3-4 months of age some infants regurgitate at least once a day, while some regurgitate with most feeds.
grade acid reflux
