Why Flash Card Printable Why Baby Sign Language Flash card (U.S. Letter) Printable Why Baby Sign Language Flash card (A4 Size) Usage: Use the why flash card when you are ready to unleash the monster. Toddlers ask about 437 questions per day. Most begin with the word why For an instructional video and tutorial on how to make the why sign, see here. Related Flash Cards: More, What, ,Who When.