YouTube Kids is mostly safe, but there's a small chance kids could see nudity, violence, or just weird stuff, as well as ads for stuff like junk food. Our study found that 27% of videos watched by kids 8 and under are intended for older target audiences, with violence being the most likely negative content type. . . . On the plus side for parents, YouTube offers fair warning that kids may see something that you don't want them to see and you can block and report inappropriate videos.