If you have a 3-year-old baby with stomach pain and vomiting, you should consider indigestion, acute gastroenteritis, food poisoning, acute systemic diseases and other causes. 1, indigestion: mostly due to improper diet, such as eating too fast, too much, or intake of a large amount of indigestible food. If the symptoms are mild, they can be relieved by applying hot compresses or massaging the abdomen. If they cannot be relieved, they can be given bifidobacteria and other drugs as prescribed by the doctor to relieve the symptoms; 2. Food poisoning: Mostly caused by eating food contaminated by bacteria, bacterial toxins, poisons or containing toxic substances. The pathogenic bacteria can be detected from excrement, vomit, leftover food, eating utensils and other symptomatic treatment. Severe cases can be treated with sensitive antibiotics, such as clindamycin, amoxicillin, etc. If the vomiting is serious, you need to supplement fluids in time to avoid water-electrolyte disorders; 4, other digestive tract diseases: if the baby has acute appendicitis, cholecystitis, pancreatitis, intestinal obstruction, intussusception, etc., can lead to the baby’s stomach pain and vomiting. Need to be sent to the doctor in a timely manner, after a clear cause to be actively treated, if necessary, need to be operated.