Sharing storybooks with babies increases their future achievements in literacy, especially in reading (Hall, 2001; Moore and Wade, 1997, 2003; Scarborough et al., 1991; Wade and Moore, 1998; Wells, 1985). This study, focusing on case studies of two 20-month-old children, attempts to identify the role the storybook plays in children’s vocabulary acquisition. Their mothers adopted a regime of daily reading of specific picture books over a six-week period, and recorded the children’s acquisition of new vocabulary, in order to explore what specific contribution these texts made to the children’s speech. The findings demonstrate that storybooks form one source of children’s newly-acquired vocabulary. Factors that might account for this were more difficult to determine through a study of this scale.

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