on occasion

now and then or here and there; "he was arrogant and occasionally callous"; "open areas are only occasionally interrupted by clumps of trees"; "they visit New York on occasion"; "now and again she would take her favorite book from the shelf and read

गर्भवती महिलाओं को समय-समय पर अपनी मेडिकल जांच करानी चाहिए।

During his stay in your State, he will be contacting Your Highness on occasions.