Hold the hands in front of the body with the palms facing the body. Move the hands up and down from the chest to the abdomen.
Form the signed number one (1) with both hands. Hold the sides of the index fingers next to each other with the fingers pointing down. Rub the index fingers up and down.
Form the hands into fists. Tap the thumbs together twice.
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.