This youtube feature will help keep kids from seeing mature content.
Q. Does YouTube have parental controls?
A. YouTube has a Restricted Mode you can enable in the settings for the mobile app, or within the web browser used to watch the videos. Restricted Mode attempts to scan and filter out the adult-oriented content posted to the site so young viewers do not see it, but YouTube admits the setting is not 100 percent accurate.
The popular video site can be the Wild West in terms of content, but you have a few ways to block inappropriate clips for young viewers.
Source: Making YouTube Safer for Children – The New York Times