Signing: Start the sign for inside by making your non-dominant hand into a cup. Then starting with you dominant hand fingers together, place them inside the cup and take them in and out.
Usage: Inside can be taught in conjunction with outside. Demonstrate the sign by placing a favorite toy inside a box, then outside.
Flash Card: Click the link to view the Inside Baby Sign Language Flash Card. The flash cards are printable and available in both U.S. Letter and A4 sizes.