Growing so fast!

I can't believe how fast Luke is growing up.  Two weeks ago I saw his first non-gas-induced smile, but he wouldn't let me capture it on camera.  This past week, I took him up to the family cabin in North Carolina and he started smiling much more, almost laughing even.  I've snapped a few pics of the cute little grin.  He also started holding on to his rattle and shaking it around.  I don't know if he's made the cause and effect link of his shaking the rattle, but he does seem a little amused with his new trick.  He'll hold on to it for several minutes at a time.