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Should I hold my child back a year before starting kindergarten?

Last updated on April 10, 2026

The evidence on kindergarten redshirting is mixed and largely does not support it as a universal strategy. Early academic advantages seen in older kindergartners tend to fade by middle school. There is some evidence that younger children in a class are more likely to be diagnosed with ADHD — but this may reflect relative immaturity being misread as a disorder.

Evidence Summary

  • Data source: Longitudinal studies and natural experiments using school enrollment cutoff dates in the U.S., Denmark, and other countries

  • Key finding: Academic advantages of being the oldest in class largely disappear by 3rd–4th grade in most studies

  • Key finding: One Danish study found modest mental health benefits from being older at school entry — more anxiety and ADHD diagnoses among youngest-in-class children

  • Key finding: ADHD diagnosis rates are higher for the youngest children in a class — some cases may reflect developmental immaturity rather than true ADHD

  • Caveat: Individual child readiness matters; children with developmental delays or social-emotional challenges may genuinely benefit from waiting

Confidence: Moderate confidence — multiple natural experiment studies exist, but effects vary by country, school system, and child characteristics.

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