Vomiting in children can be caused by acute gastroenteritis or intussusception. In addition, small children because the development of the digestive system is not very complete, may also be a physiological vomiting. 1. Acute gastroenteritis: small children’s gastrointestinal tract is relatively delicate, dietary impurity and other reasons can easily cause acute gastroenteritis, acute gastroenteritis common symptoms are fever, nausea, vomiting, diarrhea and loss of appetite. 2. Intussusception: manifested as a sudden onset of severe paroxysmal abdominal pain, the child paroxysmal crying and restlessness, may be accompanied by vomiting, there are quiet as usual intermittent period. 3. physiological vomiting: 1~2 months after birth of small children due to the development of the cardia sphincter of the stomach is not perfect, the food in the stomach may be spit out with the change of body position. Children always 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, give targeted treatment or treatment.