Standing Up In This World

Last night, Steve and I were sitting on the love seat and Lexi was playing on her mat. She scooted over to the edge of the couch between us to see what we were doing. She gracefully reached up and grabbed the cushion with one hand and then the next. Slowly but surely, she pulled herself up to stand. I kept telling myself it was just a fluke, but she did it again five minutes later. What happened to my little baby?