A 2025 meta-analysis pooling 27 studies and 67 effect sizes found that naps boost declarative memory in early childhood — and the effect size is largest, surprisingly, in 3- to 5-year-olds, exactly the age when parents most often consider dropping the nap.
A simple linear-number board game played four times — about an hour total — produced large, durable gains across four numerical tasks for low-income preschoolers. A near-identical color version produced no change. The structure of the game, not the play, was the active ingredient.
A French team followed 664 children from kindergarten through middle school — about 10 years — and found that a language-based bedtime routine predicted middle-school exit-exam performance. The bridge across that gap was kindergarten-age vocabulary.
A Finnish team followed 45 preterm infants (24–34 weeks gestation) to ages 2–3 and asked which home music activities predicted language outcomes. The honest answer: only the activities parents and children did together mattered. Background music — even classical — didn’t.
A six-month follow-up of 325 low-income preschoolers found that outdoor play in the midday window reduced negative emotional lability through better working memory — while morning and evening outdoor play did the opposite. When matters as much as how much.
Ann Masten’s landmark review synthesizing 30 years of resilience research found that what protects children through adversity isn’t extraordinary will — it’s ordinary human systems: stable caregiving, basic cognitive and self-regulatory capacity, meaning, and community.
A 26-year follow-up of 702 children finds that delay of gratification at 54 months, once family background is controlled, predicted almost nothing about adult outcomes — except BMI. The famous Marshmallow Test’s predictive power collapses under larger samples and proper controls.
A study of 1,300 Chinese middle schoolers identified a serial mediation path: parental psychological control triggers psychological reactance, which drives smartphone overuse, which harms mental health. The more parents “control,” the stronger the rebound.
A randomized controlled trial across 15 elementary schools in Montreal evaluated a 7-week parent training program grounded in self-determination theory. Externalizing problems dropped significantly in the treatment group and the effect persisted at the 6-month follow-up.
A 5-year longitudinal German study of 789 adolescents identified four parenting profiles and found that “limited supportive” parents — who are generally warm but use conditional regard in specific situations — produced internalizing problem outcomes statistically indistinguishable from truly neglectful parents.