The reasons that cause babies to hiccup all the time may be crying while eating, cold stimulation and flatulence. 1. Crying while eating: If the baby opens his mouth and cries while eating, causing a lot of air to enter the digestive tract, and this air stimulates the diaphragm, causing diaphragmatic spasm, the baby will hiccup all the time. 2. Cold stimulation: if the baby’s gastrointestinal tract is stimulated by cold air, cold food or cold water, causing vagus nerve excitation, diaphragm contraction activity hyperactivity, can always lead to hiccups. 3. Flatulence: when your baby has flatulence, the excess gas will compress the diaphragm, causing diaphragmatic spasm, which will cause hiccups all the time. If your baby’s hiccups are not relieved, or accompanied by other symptoms, you should go to the hospital in time to clarify the cause of the hiccups and then give targeted treatment.