The LES acts as a valve between the esophagus and the stomach. It opens up to allow food into the stomach and then closes in order to protect the esophagus and other organs from acidic reflux. Unfortunately, it is difficult to determine if an infant has developed a chronic form of heartburn called gastroesophageal reflux disease or GERD.

In order to determine if an infant has a chronic form of heartburn (GERD) you should consult your pediatrician. Look for clues such as sleeping problems, coughing, weight loss, lack of appetite, spitting up frequently, and apnea. Acid reflux disease can cause respiratory problems including pneumonia, strictures and ulcerations on the esophageal wall, and malnourishment. Infant acid reflux symptoms usually include recurrent coughing, bad breath, spitting up frequently, unusual irritability and crying, chest pain, and sore throat. 

There are several causes of acid reflux in infants. Many of the causes are exacerbated by the fact that infants, much more so than adults, consume mostly liquids and spend a great deal of time on their backs or in a supine position. Combined with the backwash potential of liquids, lying down puts pressure on the LES (esophagus valve) and increases the chances for reflux. Other causes could be attributed to the anatomy of a child