How can I disapprove previously approved apps?

How can I disapprove previously approved apps? I approved an app for my child, but then realized it was not appropriate and want to disapprove the app so he cannot continue to download it once I deleted it. I also do not want to disable his ability to download apps, I just want to disapprove this one app and still allow him to download/ask for approval of apps going forward. This is a question from quite some years now, however I believe the programming should be able to be accomplished by now. Are there any updates for adding this feature to iOS or Mac OS?