Gastroesophageal reflux (or “acid reflux” or “heartburn”) occurs when stomach and food acid reverses from the stomach back into the esophagus. Typically the Lower Esophageal Sphincter (LES) acts as a valve and keeps food on its way down after you swallow. Reflux in infants is comprehensive because a baby’s LES is still weak, as the necessary muscles haven’t strengthened yet. Symptoms of acid reflux for adults include a burning sensation in the chest and throat or a bitter, puke-like flavor in the mouth. Some people with repeated symptoms of acid …