Hi and thanks for the query, fever in a child, especially with a past history of vomiting deserves an intensive investigation and clinical evaluation. It important to exclude a bacterial infection. Examination of the child s ears, throat, lungs, abdomen and other body structures by your primary care physician is very important. Generally, diarrhpoea in children however is mostly caused by viruses, and giving the child sufficient oral rehydration solution appropriately is usually sufficient. Changes in the child s general outlook should lead to a formal exclusion of a serious infection or complications of the diarrhea. Blood tests for raised white blood cells, C reactive protein, urine and stool exams could be needed for a start. I suggest you consult your primary care physician for a proper evaluation and management. Best regards, Luchuo, MD.