From this 2020 YouTube announces a new regulation regarding the content created for children on the platform. It should be indicated in all the videos if the content is "suitable for children" or not. This new regulation affects all users regardless of their location.
This regulation is related to the uploading of videos but not to the digital distribution of music on Youtube Music and Youtube Content ID. Therefore, it will not affect the sending of music to these YouTube channels and nothing should be indicated at the digital distribution level.
For more information on this topic, you can consult the article in the Youtube support center.