Use YouTube Restricted Mode
Turn on parental controls with Google Family Link
Set up a supervised account for the child
Restrict YouTube access on the device with Screen Time or Digital Wellbeing
Block the YouTube app with app restrictions or app lockers
Use router-level website blocking for youtube.com and youtu.be
Set DNS filtering to block YouTube
Remove sign-in access to the YouTube account
Change the Google account password
Enable two-factor authentication on the Google account
Log out of YouTube on all devices
Disable app installs from unknown sources
Use device-level content restrictions on iPhone, Android, Windows, or Mac
Set up a separate child profile on the device
Use browser extensions or safe browsing filters to block YouTube
Uninstall the YouTube app
Block YouTube in the hosts file on a computer