For posterity, I want to list Henry's current vocabulary at a few days shy of 15 months:
Baba for any and all drinks
Wawa for water
He also sings the first part of "Row Your Boat." When we read Polar Bear Polar Bear What Do You Hear? he repeats the animal noises but won't do them on command.
He also now knows his head, nose, feet, mouth. He can also follow two step commands such as "Get your slippers, they are in the kitchen." His receptive language is excellent, I feel like he understands almost everything we say now.