Children with affluent parents are twice as likely to have a delayed school start as those from a low-income home. There is a similar gap between white and Black children. Boys are more likely to be redshirted than girls, especially by parents who are teachers.6 Children who are young for their school year are also more likely to be held back a year. When these factors are combined, the rate gets quite high. Among summer-born boys with BA-educated parents (the kind of folks who read Outliers), the redshirting rate is 20%, according to an analysis of the 2010/11 data by the Northwestern
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