This was originally an archive style that was recently reissued for adults. But you can now also get the Dr Martens Buster B boots for kids, which is obviously a good thing.
The original was the Capper, which was designed to work for kids back in the day, but never actually made it. That has been put right now, with this boot available in 3 through to 5. Ok, not a great spectrum, but better than nothing.
As for the style, this is a four-eye boot with a full-grain leather upper, inside zip fastening, contrast stitching and a heel loop. £55 is the retail price.