To sign climb, just mimic climbing or bouldering. Take both hands and make the ASL letter C sign, then have each hand take turns climbing up one rung or level.
Climb is signed just a bit like ladder, so be careful not to get the two confused. When you sign ladder, your grasp closes into a firm fist, whereas your 'C' hand stays open when you sign climb.
Teach your baby or toddler the climate sign when you are describing what you are seeing in a cartoon or story book, or what you are doing at home (for instance, climbing a ladder to replace a busted ceiling light) or outdoors (for example, climbing a mountain trail).
Teach your child this sign in the context of climbing a ladder, going on a hike up a slope, or when you see it being done in a story or cartoon.