Frequency per million of nouns occurring in isolation, at the edge (beginning or end), or in the middle of an utterance, for infant- (IDS), child- (CDS), and adult-directed speech (ADS), split by the top 50 nouns in the child’s input versus the remainder of the nouns.

The relative proportions of noun tokens in each utterance position in each register are indicated as a percentage underneath the frequency count. Frequency per million has been rounded to the nearest whole integer.