Growing up so fast!

Landon reminds me about how he is "growing up so fast!" and "Chase growing up so fast too!" They really and truly are! I can't believe the conversations that I have with Landon now. Yesterday he was telling me about how a caterpillar turns into a butterfly - sometimes he really amazes me. And Chase will spill out full stories using hand gestures and everything...what he is saying, I have no clue, but he thinks he is saying words.
But just when I think they are all grown up... I took Chase shopping today and was in Pottery Barn. I was just about to check out when he decided he did not want to be in his stroller and longer. So I let him out and he wants to push the stroller all around the store bumping into whatever gets in his way. And trying to check out, I grab the stroller and him, he then falls over the wheel, knocks his head on the concrete floor (I heard the thump!) and he is hysterical. I scoop him up while a lady behind me decides to inform me of what just happened (hello? I was standing right there!). I nod politely, finish paying, carry Chase, push the stroller, and carry my one hundred pound bag out of the store.