I've seen information entered into a block on the front and a special block on the back that was embroidered. I made my niece one when she had her baby years ago. Looked like a pocket on the back with double ric rac for trim on the top of the pocket. Pull the other row of ric rac and you can put the label out and read it. It tucks nicely in. If you want to hide the label just don't put any ric rac or trim. Just make it look like a part of the block. I've seen labels sewn into part of the sashing. Just used a washable pen then handsewed the letters.