Screw earrings are normal earrings the only difference is that as you push the back onto the post it is threaded so it screws on for added security. It’s usually done on more valuable pieces.

Actually, that’s not recommended. As you, and thus your ear, grow what was once the center of your ear may not be any more. It is common that a piercing done in infancy won’t be properly placed once the person is an adult. Also, for a baby you have to use a gun which is not the best way to do it by any means. …