Young children whose parents read them five books a day enter school having heard about 1.4 million more words than children who were never read to, a new study found. This 'million word gap' could be one key in explaining differences in vocabulary and reading development. Even children who are read only one book a day will hear about 290,000 more words by age 5 than those who don't regularly read books with a parent or caregiver. Children who hear more vocabulary words are going to be better prepared to see those words in print at school and are likely to pick up reading skills more quickly and easily. State's Crane Center for Early Childhood Research and Policy.