Andrew says

The boy's vocabulary at 18 months. Because I want to remember...

Animals: dog, cat/kitty, bird, monkey, duck, sheep, frog, elephant
Toys: ball, book, TV ("teeee?"), slide
Sounds: moo, baa, neigh, woof, maiow, duckduck, roar, croak, awooo (wolf howl), bfphhhhh (elephant sound), vrooom
Body parts: nose, eyes, ears
Vehicles: truck, car, choo-choo, bus
Food: water, milk, bottle, cheese, cracker, apple, banana, cereal, grapes
Clothes: shoes, socks, hat
Commands: again, more, up, down, out, go!
Greetings: hi, bye, night-night
People: ma, da, baby, Riley, Michelle ("Shell")
From TV: backpack (from Dora), Elmo, Cat in the Hat ("Hat!")
Phrases (sort of): all done, where is it? ("wherzee?"), there it is! ("deyitizz!"), knock knock
Exclamations: uh-oh, oh no, oh man, no, wow, yay, whoa, all right, score
Miscellaneous: uh-huh, bath, bubbles, hot, brrr, rain, dark, light, fan, nice

And the list grows by the day. I love it!