In children with fever and vomiting, if they are conscious and if the possibility of central nervous system pathology is ruled out, it is usually caused by acute gastroenteritis or extraintestinal infections. Acute gastroenteritis is an acute inflammation of the gastrointestinal mucosa, the main cause is bacterial infection, in addition, if you eat rough, cold food, overheating and other strong irritating food may also cause acute gastroenteritis. If you have acute gastroenteritis, you may have vomiting and diarrhea, and in severe cases, you may have fever, dehydration, or even shock. Extra-intestinal infections such as pneumonia can be viral, bacterial, mycoplasma, or mixed infections. It may be accompanied by abdominal pain, bloating, diarrhea and vomiting. When a child has a fever and vomiting, it is important for parents to understand the cause of the fever and vomiting so that they can choose the most appropriate medication and treatment. If there is no way to determine the cause of the baby’s fever by this symptom alone, it is best to send the baby to the nearest hospital for treatment in a timely manner.