What are newborn hiccups? Newborn hiccups refer to the phenomenon that the baby\’s cardia (responsible for controlling the switch between the esophagus and the stomach) is immature after birth, causing food to reflux into the esophagus after feeding or crying. This reflux irritates the nerves in the esophagus, causing the breathing muscles to contract uncontrollably, causing hiccups. While hiccups are common in newborns, they can cause rare but serious breathing problems if not treated correctly. Therefore, it is important to know how to relieve hiccups in newborns. How to relieve hiccups in newborns? by