Causes of Hiccups in Babies Hiccups in babies are caused by air entering the stomach or indigestion and are not a sign of health. There may be many reasons for hiccups in babies, as follows: 1. Eating too fast Sometimes when babies eat, they may eat too quickly, causing them to swallow too much air. The accumulation of air may cause hiccups. 2. Indigestion The digestive capacity of infants\’ stomachs is not strong, so they may burp due to indigestion. Indigestion may be caused by lactose intolerance or overfeeding. 3. Gastroesophageal reflux Gastroesophageal reflux refers to acid reflux