Is this an authentic Dustin Pedroia autograph?

I bought this Louisville Slugger at Goodwill and it has "Dustin Pedroia #15" written on it. I don't think it's authentic since it's a child's bat, but I figured it was worth it to check it out. Here's a photo: http://img.photobucket.com/albums/v340/Eggness/P4131446.jpg