Hi Mam. Most common cause of fever is Viral and it subsides in few days. What do you mean by tendency to go to urine regularly? If you meant urine is more frequent than normal, then it may be urine infection. Needs urine test to see if any infection is there.
Next Steps
Pls see the articles on fever I wrote for further information.
"My Child Has Fever! What to Do?" by Dr. Sreedhar RS - https://www.practo.com/healthfeed/my-child-has-fever-what-to-do-25940/post
"Danger Signs - When Fever in Kids Can be More!" by Dr. Sreedhar RS - https://www.practo.com/healthfeed/danger-signs-when-fever-in-kids-can-be-more-26142/post
Health Tips
Pls see a nearby Pediatrician if fever doesn't come down in a day