Teach your baby the sign for the word outside in baby sign language with the following description and video.
Form the hand into a claw. Touch the fingertips of the claw to the shoulder on the same side of the body. Pull the hand away from the body while closing the fingers into a flattened O.
Beyer, Monica. 2006. Baby talk: A guide to using basic sign language to communicate with your baby. New York: Jeremy P. Tarcher/Penguin.