It's a personal decision. I was baptized very young and barely remembered it (it was my own choice, though, and God had definitely been moving in my heart - to this day I distinctly remember the first time God tugged on my heart). When I was a teen, I decided to be re-baptized, since I understood baptism more, and wanted an experience I could remember.
For me, honestly.... if I had it to do over, I wouldn't do it over.
It was like my immediate thought after baptism was - that wasn't necessary. It wasn't a special thing that I remembered.... I actually felt rather silly.
So, it's really up to you. If it will be a special thing for you, go ahead. But I don't think it's necessary at all.