yes BUT you cant save apps to it. Its JUST storage. Honestly when they removed the ability to load apps onto the SD card i died a little inside. but, that isnt just the nabi...its all android based devices.
While the memory in nabi Jr. tablets is fixed, they do feature a memory card slot that supports MicroSD media. For additional information, make sure to check out the following article on Nabi's official support site:
It would probably depend on your child. My 4 year old has mastered the tablet. Its very user friendly. once past the initial learning curve its a breeze.