The main causes of vomiting in three-year-old toddlers are indigestion, acute gastroenteritis, food poisoning, etc. The main methods to stop vomiting are medication. 1. indigestion: three-year-old toddler vomiting may be related to indigestion, if the diet is not regular or improper feeding, eating too much at one time, may lead to indigestion, vomiting symptoms. It is recommended to eat regularly and maintain balanced nutrition, and you can use gastrointestinal tablets, lactobacillus tablets and other medications under the guidance of a doctor to regulate the balance of intestinal flora and avoid aggravation of the symptoms. 2. Acute gastroenteritis: three-year-old children with acute gastroenteritis after intestinal infection by pathogens may lead to vomiting symptoms, you can follow the doctor’s instructions to use montelukast, rehydration salts and other medications to relieve vomiting, to avoid dehydration, electrolyte imbalance and other conditions. 3. Food poisoning: If a child has food poisoning, nausea, vomiting and abdominal pain may occur, and it is recommended to consult a doctor in time for gastric lavage and detoxification treatment. You need to observe your child’s physical condition more often, and if you find any abnormality, you need to actively seek medical attention.