If a child has hiccups with a sour smell, they are mostly caused by indigestion, gastrointestinal dysfunction, gastrointestinal inflammation, oral inflammation, etc. They need to go to the hospital for examination and treatment after clarifying the causes. 1. Indigestion: Eating too much or eating indigestible, sweet and greasy food, coupled with the imperfect development of the child’s gastrointestinal function, can lead to a reduction in gastrointestinal peristalsis, and the ingested food cannot be digested in time and stays in the gastrointestinal tract for a long time, fermenting and producing The unpleasant taste and the burping can be manifested in the form of hiccups. You can apply hot compresses or massage the abdomen, or take oral medication as prescribed by the doctor to promote digestion; 2. Gastrointestinal dysfunction: Mostly due to the child’s gastrointestinal function is not well developed, manifested as burping with sour smell, diarrhea, constipation, abdominal pain and other symptoms. It is necessary to follow medical advice to be treated with probiotics and so on. Pay attention to diet, do not eat cold, greasy food, regular meals; 3, gastrointestinal inflammation: bacterial or viral infections can lead to gastrointestinal inflammation, baby hiccups with a sour smell, accompanied by abdominal pain, vomiting diarrhea symptoms, should promptly seek medical attention, according to the patient’s situation to give oral medication, such as the application of montelukast to stop diarrhea, the application of probiotics to regulate intestinal flora, oral antibiotics if necessary; 4. Oral inflammation: daily parents do not pay attention to cleaning the baby’s mouth, which may cause food residues to remain in the baby’s mouth, which in turn may cause bacterial infection and hiccups with sour smell. It is recommended that parents keep the baby’s oral hygiene daily, and if the oral inflammation is more serious, it is recommended to seek medical attention. Usually children should drink more water, pay attention to dietary hygiene, eat on time, avoid overeating, eat more vegetables and fruits, and avoid eating spicy, stimulating and greasy food. In addition, they should also develop good habits, brush their teeth in the morning and evening, and rinse their mouth after meals.