Custom Baby Shark Graphics Front and rear fenders Adjustable seat post R Exclusive, only available at Toys R Us Canada. Let's learn to ride doo, doo, doo, doo, doo, doo, on our custom Baby Shark 10" balance bike. With gleaming custom baby shark graphics, front and rear fenders and fully adjustable seat post, this awesome learning tool is sure to have the kids swishing about riding and balancing with their feet off the ground in no time.