They are all growing up.

This one is old enough to play in the grass,
sit up,
and get dirty (not to mention she scoots now, is growing her first tooth and eats "real" food).This one is old enough to love all things Star Wars,
and help feed his baby sister (and button things, hold real conversations, and keep underwear clean and dry).
This one is losing her first tooth and can read all by herself.
And these two. . .
. . .you can tell these two are growing up because all of a sudden their shirts fall off those little-kid hangars and it's getting harder and harder to tell their socks from Nate's and mine when sorting laundry.