Bike handle

Not sure if it's this brand, but this is what it looks like. Super handy for helping your child learn to ride without training wheels! Allows you to keep them upright with as much or as little assistance as needed - and saves your back! The height is adjustable and bolts on to where the training wheels would bolt on.

https://www.readysetpedal.com/products/balance-buddy?srsltid=AfmBOorsA9xWabPyfnVZ1raSAldQmuVvQu0wYxVYY3SL6K4EF4pCQLOL