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Robert Byrd, an assistant professor in the UC Davis Department of Pediatrics, conducts research in the area of delayed school entry, and he strongly advises parents to enroll their children in kindergarten at the correct age, so they can learn with their peer group. In fact, studies indicate that children who seem immature at the beginning of kindergarten tend to catch up with their classmates within a few years. And Byrd's own research shows that delaying school entry may be harmful to children who are older than their classmates.