I have 2 sons, 4 and 5
absolutely no infections of any kind, ever
no redness of any kind, ever
My youngest, who loves to push his foreskin back, once after an overzealous inspection told me that his penis hurt. I put on some ointment and when I questioned him about it the next day, he said it was fine.
My oldest complained once after having a bubble bath. Same again, put on ointment and the next day he was fine.