Baby horses are born with something called "foal slippers". I would have guessed that horses came out of the womb with smooth, pretty little hooves. Unfortunately, I was wrong. Baby horse hooves are covered in rubbery hoove fragments. The rubbery texture is called a "capsule", and protects the mama horse from the sharp, uneven hoof fragments while the baby is passing through the birth canal.
"Foal slippers – commonly know as 'Golden slippers'. When foals are born, their hooves are covered in a rubbery layer known as a capsule. This soft capsule covers the sharp edges of the foal's untried hooves, protecting the mare as the foal travels along the birth canal. You have to be quick to snap a picture of the slippers as they begin to dry out and wear away the minute that they make contact with the air. During the foal's first venture across the ground the soft hoof capsules are worn down to meet the level sole, revealing the hooves we are used to seeing. How amazing is that?"