Infant burping with sour odor may be the emergence of indigestion, gastritis and other diseases, the advice is to seek medical attention to clarify the cause. 1. Indigestion, if the baby has indigestion, the food can not be completely digested and absorbed, fermentation may appear after this symptom. 2. Gastritis, some babies with gastritis may have hiccups with a sour odor because the stomach is irritated by the inflammation, which may affect the digestion of the baby. Infants hiccups with sour odor may also have other reasons, it is recommended to go to the hospital in time to improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.