Teach your baby the sign for the phrase thank you in baby sign language with the following description and video.
Form a flat hand. Touch the fingers to the chin. Lower the hand to chest level.
Beyer, Monica. 2006. Baby talk: A guide to using basic sign language to communicate with your baby. New York: Jeremy P. Tarcher/Penguin.
Porpora, Tracey. 2011. The complete guide to baby sign language: 101 trips and tricks every parent needs to know. Ocala, FL: Atlantic Publishing Group, Inc.