In this video clip, four infants and a teacher sit together on the floor exploring objects. As they play, one of the infants utters a series of consonant-vowel syllables that sounds something like a song verse. She says, “Da-dah, da-dah, dah.” Notice how the teacher treats the infant’s babbling as an intentional effort to communicate and follows the child’s lead by responding with a verse of her own. Also observe how the teacher repeats the same consonant-vowel syllable introduced by the infant but works to extend the child’s initial contribution by varying the rhythm and creating a longer verse. In addition, the teacher scaffolds the infant’s knowledge about the pragmatics of language use by highlighting the turn-taking structure of their exchange. She cues the child by saying, “You’re turn.”