Steering is the easier part in navigating the kayak, and the more difficult one is tracking.
Teaching your child to steer requires a bit of patience because a child’s motoric and cognitive capabilities are not fully developed.
The child may not understand the effect of moving the paddle in the water, and will certainly have a problem visualizing the blade’s position in it, and therefore its effect on changing the boat’s direction.
However, kids like to learn new things, and eventually they do that too.
You should try and observe the paddle’s position and see if the child is not applying a J stroke without knowing it – A J stroke is what canoeists use when they want to steer their canoes in the same direction as the side they’re paddling on.
Being small can actually be an advantage when it comes to steering a W Kayak since it makes it easy for the child to lean into the turn. Therefore, you can try and teach your child to do it at a very early stage, and it would prevent him/her from leaning to lean to the side on which the paddle is moving and by that involuntarily steer the boat in the wrong direction.
All this may sound complicated but it’s not if you’re a reasonably good W paddler yourself.