I think a wired mouse would be better for students to prevent kids from losing, and stealing the mouse as easily. There is also a chance that kids which are too young may put a very small mouth in their mouth, and get shocked by the battery in the mouse if the mouse gets wets in their mouth, or them chocking on the mouse.
I think regular size mouses are easier for young kids to learn how to use because of the bigger buttons. There are also some mouses which are shaped like cars, animals, and toys which may make kids more likely to want to use the mouse.