When did this happen?

Anytime I get a sneak peek of Carter still sleeping in her crib, I'm always amazed at how big she is getting. When did this happen? It seems like yesterday that she was "itty bitty" in her crib. She used to sleep in the middle of the crib and never touch the bumper pads. At one time, I thought the crib was too big for her. Now, she can not help touching the sides...and spilling over. What a big girl!