This video was taken two years ago (November 2009, age 5). C is talking about the pygmies and vampire bat in Pocket God. (Note his “I heart speech therapy” sticker)

Nearly a year later (August 2010). C reading The Very Hungry Caterpillar.

Nearly a year later again (July 2011). C and D swimming in the pool. C is the one who says “it’s cold underwater”, so you can really measure the speech difference in him.

And in August 2011, C again reading The Very Hungry Caterpillar.