You have ultimate control over the display of your content on YouTube and you may exercise that control at any time by removing your content. If you have concerns about the availability of your content in YouTube Kids specifically, you may submit a request to remove specific content on your channel from YouTube Kids.
Please note that this form may only be submitted by the uploader of the content in question. To verify that you're the uploader, you must be logged into the account that was used to upload the video(s).