TV-Y7 is the current rating for SpongeBob SquarePants. This show was originally rated TV-Y until around either 2006 or 2007. The reason for this change is because of frequent amounts of anger and negative endings.
It is part of the television rating system launched in 1997. These shows may be suitable for all, but may not be appropriate for some children under the age of 7. This rating may include mild fantasy violence, mild or suggestive humor and may contain some content not appropriate for younger children.