He doesn't usually pee that often in an hour. Is it normal all of a sudden that he goes really often and that it's mini pee?

Hello, since 1 week and a few days, my 4 years old boy often makes small pee. In one hour, he has to go to the toilet very often to make mini pee. His penis seems normal and does not hurt at all. He is also clean during the day and night and he doesn't pee in his bed either. I wonder if he has an infection or something else.