I'm tired of being little

John David expressed his frustation that he could not reach his towel as he got out of his bath. I told him I could help him...he responded "I'm really tired of being little." In an effort to make him feel better I told him he was bigger than Sammy, Carlos, and Emma. He responded "I'm not as big as you or daddy." At that point I just told him he would grow little by little. I'm sure that wasn't too reassuring, but what else could I say.