“Before the pandemic (which seems to have caused a surge in the practice), about 6 percent of children waited an extra year before beginning kindergarten. But here, too, some children were much more likely to be held back than others: specifically, those with affluent or well-educated parents, and who were white, young for their year, and male.”

Sounds like an equity problem that we can solve by disallowing parents from waiting a year to enroll their boys. It’s the only way to be fair to non-white, non-affluent girls and fight structural racism, classism, and sexism.