Three-year-old children always eat vomit may be related to bad habits, may also be indigestion, acute gastroenteritis and other factors. 1. bad habits, if the child is often strenuous exercise during meals, the stomach is shaken, may lead to three-year-old children eat always vomit symptoms arise. 2. Indigestion, if the child has indigestion, food digestion and absorption is affected, food reflux into the esophagus may appear this symptom. 3. Acute gastroenteritis, some children with acute gastroenteritis due to gastrointestinal dysfunction, nausea and vomiting may occur. Three-year-old children always eat vomit may also have other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, to give targeted treatment or treatment.