I know that Liam hears everything I say, and takes in more than I realize. But sometimes it's made abundantly clear.
I often tell Liam to stop doing *insert gross boy trick of the day* because "It's Gross". (OK, child of the 80's. At least I don't say "Stop that, it's like, so gross. Like, gag me with a spoon.")
Today I was getting ready to nurse Rhys, and I just flung my nursing pad on the coffee table. I didn't realize that Liam had a bunch of his hot wheels there, until he exclaimed at me: "Oh Non, Mommy! Pas sur mon auto jaune - Dat's Gross!"