To see whether the infield gloves you are considering tend to be a good choice, look at the stitching on top of the side from the glove.
The helmet should fit snugly, but low number of tight. They can take one or two steps perhaps dive and field that ball and turn and make a play. http://Sotongeekjam.net/doku.php?id=step-by-step_guide_to_picking_the_ight_baseball_batting_gloves