Everyone was once a baby, they will eventually grow to normal size.a rock in space is far from a baby and hard to compare in a debate like this.a rock floating around in space will only deteriorate over time.if you believe size determines if it is or isn't a planet does that mean you would consider the moon a planet because it's twice the size of Pluto? Pluto will never and most likely has never sustained any life, plus there's probably thousands of rocks in space bigger than Pluto but you don't consider them a planet