Causes of Hiccups in Newborns Hiccups in newborns are a common phenomenon, and generally speaking, there is no need to worry too much. But understanding the causes of hiccups can better help parents deal with the phenomenon. The esophagus and stomach of newborns are not fully developed yet. Therefore, when the baby feeds, gasps or swallows milk, some air will enter the stomach, so burping is the reason for the