Brief ReportWhen Children Are Not Read to at Home: The Million Word GapLogan, Jessica A. R. PhD*; Justice, Laura M. PhD*; Yumuş, Melike PhD†; Chaparro-Moreno, Leydi Johana*Author Information *College of Education and Human Ecology, Department of Educational Studies, Crane Center for Early Childhood Research and Policy, The Ohio State University, Columbus, OH; †Başkent University, Ankara, Turkey. Address for reprints: Jessica A. R. Logan, The Ohio State University, 29 W Woodruff Avenue, 211A Ramseyer Hall, Columbus, OH 43210; e-mail: Logan.firstname.lastname@example.org. Disclosure: The authors declare no conflicts of interest. Supplemental digital content is available for this article. Direct URL citations appear in the printed text and are provided in the HTML and PDF versions of this article on the journal's Web site (www.jdbp.org). Journal of Developmental & Behavioral Pediatrics: June 2019 - Volume 40 - Issue 5 - p 383-386 doi: 10.1097/DBP.0000000000000657 Buy SDC Metrics AbstractIn Brief Objective: In the United States, there are numerous ongoing efforts to remedy the Word Gap: massive differences in heardvocabulary for poor versus advantaged children during the first 5 years of life. One potentially important resource for vocabulary exposure is children's book reading sessions, which are more lexically diverse than standard caregiver-child conversations and have demonstrated significant correlational and causal influences on children's vocabulary development. Yet, nationally representative data suggest that around 25% of caregivers never read with their children. Method: This study uses data from 60 commonly read children's books to estimate the number of words that children are exposed to during book reading sessions. We estimated the total cumulative word exposure for children who are read to at varying frequencies corresponding to nationally representative benchmarks across the first 5 years of life. Results: Parents who read 1 picture book with their children every day provide their children with exposure to an estimated 78,000 words each a year. Cumulatively, over the 5 years before kindergarten entry, we estimate that children from literacy-rich homes hear a cumulative 1.4 million more words during storybook reading than children who are never read to. Conclusion: Home-based shared book reading represents an important resource for closing the Word Gap. This article has supplementary material on the web site: www.jdbp.org. Copyright © 2019 Wolters Kluwer Health, Inc. All rights reserved.