Teach your baby the signs for the words I, me, mine, and my 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.
I and Me
Point to the chest with the index finger.
Mine and My
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.