There are two words that we know for certain Declan knows: his name, and the word "BATH".
I'm sure he knows a lot of other words too, but there is just no doubt with these two. When he hears them he'll stop whatever he's doing and whip his head around to look at you, and he gets this HUGE grin on his face!
He absolutely loves bath time! When he hears the water running he goes "fast crawling" straight for the tub. He loves splashing, playing with toys, and trying to stand up and turn the knobs (THAT drives me crazy).
I love that he's starting to develop very definite opinions and interests; he's such a little person these days!!