To sign cave, form both hands into the ASL letter C sign. Hold them one in front of the other. While keeping your non-dominant 'C' hand steady, move your dominant 'C' hand forward and away from the other hand, indicating the length of a tunnel.
Teach your baby or toddler the cave sign in the context of a story involving an adventure in a cave, or if you are actually preparing to visit one as a family during a trip.
Teach your child this sign when you encounter a cave in a story book or on screen, or when you are preparing for a visit to an actual cave.
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