“…Second, studies examining the extra-textual talk produced by caregivers when sharing books with young children (see Fletcher & Reese, 2005, for a comprehensive review; also Leech & Rowe, 2014) demonstrate its qualitative and quantitative benefits when compared to everyday CDS (e.g., Hayes & Ahrens, 1988; Snow, Arlman-Rupp, Hassing, Jobse, Joosten, & Vorster, 1976). For example, Hoff-Ginsberg (1991) analysed mothers’ speech across four contexts (mealtimes, dressing, toy play, and book reading) and found that the mothers’ rate of speech, MLU, and lexical diversity was highest during the book reading activity.…”