Just wanted to add a post because it had been a few days. Sophie is starting to say 'mama' and 'dada' a lot. We don't really think she's calling us particularly, but more that she's trying out the words. She tends to say Mama a lot when she's hungry, and she tends to say Dada a lot when she wants to play... that says a lot about our roles in her life.
She also has become very ticklish recently, which is making diaper changing a lot of fun. I've discovered that a baby sock used as a sock puppet on my hand makes a very good tickle device so far.