IF a small child were to release a balloon into the atmosphere what would happen to the size of the balloon as it makes it way higher in the sky?

As a balloon ascends into the atmosphere, the decrease in atmospheric pressure causes the gas inside the balloon to expand. This expansion increases the size of the balloon until it reaches a point where the material can no longer stretch, potentially leading to the balloon popping. Eventually, if it doesn't burst, the balloon will continue to rise until it reaches a height where it can no longer sustain itself.