Teach your baby the sign for the word stop in baby sign language with the following description and video.
Hold one flat hand in front of the body with the palm up. Chop the other flat hand onto the palm of the first hand.
Acredolo, Linda & Susan Goodwyn. 2009. Baby signs: How to talk with your baby before your baby can talk, 3rd edn. New York: McGraw Hill.
Beyer, Monica. 2006. Baby talk: A guide to using basic sign language to communicate with your baby. New York: Jeremy P. Tarcher/Penguin.