It's probably not the best tool for filing horse feet, especially for the price, and I doubt there is a rough and smooth edge given the size. I would invest in a 'real' horse rasp, if you are wanting to help your baby's feet. But, you really need to seek out a farrier first, in order to make sure you are getting the angles correct, especially because they are young and developing.
That was a discussion about this "device" on this forum while back when it just came on market. I (and number of other people here who do own trim) don't like the idea of it. :) You can look I believe in "Tack" section.