The reason for the hand trailing technique is to help find landmarks, objects, or doorways while traveling next to a surface such as a wall. When your child was young, they probably trailed or cruised the furniture. When they did this, they were perpendicular to the furniture – facing it. Now when they are trailing the walls, they are walking parallel to the walls.
To begin, place the back of the hand on the wall with fingers slightly curved to prevent jamming them into door frames or other objects. You can have your child hold a small ball to get the feel of curved fingers. Have your child explore your home – finding door knobs, open spaces, and other fun places in your home.
It is also important for your child to be able to use both hands. Have your child practice walking with their left and then right shoulders next to the wall and switch their trailing hand.
You can also encourage your child to hold something in the opposite hand. This will be an important skill to learn when carrying a cane.
Have fun exploring the world with your child!