Teach your baby the signs for the words I, me, my, and mine in baby sign language with the following descriptions and videos. Note that the signs for I and me and for mine and my are identical.
Point to the chest with the index finger.
Place the palm of the hand on the chest.
Beyer, Monica. 2006. Baby talk: A guide to using basic sign language to communicate with your baby. New York: Jeremy P. Tarcher/Penguin.