A study published in the *Journal of Developmental & Behavioral Pediatrics* found that children who are read to regularly are exposed to approximately 290,000 more words by age 5 compared to those who aren't. This "million-word gap" significantly contributes to vocabulary acquisition and reading comprehension skills.
Furthermore, research indicates that the quantity of parent-child book reading interactions predicts children's later receptive vocabulary, reading comprehension, and internal motivation to read. This emphasizes the long-term benefits of early shared reading experiences.