"Let the parents decide. My daughter was born August 31st. Had she been born September 1 , she could have started 1st grade a year later."

"Why should this bureaucrat date dictate my child’s education?"

So says the top-rated comment at "D.C. banned ‘redshirting’ years ago. Here’s why people are talking about it. The controversial practice of delaying kindergarten enrollment by a year has been allowed to happen at a small number of schools" (WaPo).

I think the answer to her question why is: It's part of the struggle against (what is perceived as) white privilege: "It is difficult to determine exactly how common it is to delay a child’s enrollment in school. Some national data suggest it’s rare — somewhere between 3.5 percent and 5.5 percent of eligible children do it. Most of those students are boys born in the summer months. Academic redshirting is also more common among White children at schools that serve large numbers of wealthy families, who can afford an extra year of preschool or day care, according to an article published by the American Educational Research Association."

ADDED: The Supreme Court's opinion in Mahmoud v. Taylor, which upheld the parents' right to exempt their own children from the school's gender-ideology indoctrination, relied heavily on Wisconsin v. Yoder, which upheld the parents' right to exempt their child a school requirement that had to do with the age of the child. In Yoder, Wisconsin wanted to compel school attendance up to the age of 16, and the parents, Amish parents, sincerely believed that schooling beyond 8th grade impairs religious salvation. They wanted their children to avoid the "worldly educational environment" and sought a different kind of wisdom and way of life, and the Supreme Court viewed their preference as a constitutional right. I'd thought of Yoder as a marginal case until I saw Mahmoud v. Taylor.

The WaPo commenter's slogan "Let the parents decide" resonates.