Before my daughter learned to speak, she learned to sign, and the first sign she mastered was “more.” More meant more—as in, “Give me more milk before I scream-cry in 5-4-3-2-1 ...”—but for her, it also meant “again.” Sing that song again. Push the toy cash register button again. Make that funny sound with your armpit again, again, again.

Before my daughter learned to speak, she learned to sign, and the first sign she mastered was “more.” More meant more—as in, “Give me more milk before I scream-cry in 5-4-3-2-1 ...”—but for her, it also meant “again.” Sing that song again. Push the toy cash register button again. Make that funny sound with your armpit again, again, again.