A study of 109 children aged 3–6 in Wuhan, China found that only first-borns — not all children with siblings — outperformed only-children on theory of mind. And the only-child gap closed after just two weeks of a short language-based intervention, suggesting it was never a fixed limitation.
Researchers observed 33 Head Start classrooms and coded the gestures teachers made while reading picture books to 306 four-year-olds. Classrooms where teachers used more meaning-focused gestures — like spreading their arms wide on “huge” — had children with higher end-of-year receptive vocabulary. The hand may open a second channel for kids who can’t yet catch every word.
Leslie Rescorla followed 26 children who were late talkers at age 2 all the way to age 17. Every one of them ended up in the average range for adolescent language and reading — though they sat slightly below their same-SES peers who had not been late.
A Canadian study of 242 children compared two faces of “controlling attachment” — the demanding child and the caretaking child. Same root, different branches. The caretaking children had more internalizing problems and more loss in their family histories.
A Yale RCT randomized 124 anxious children to either standard child-only CBT or a parent-only program (SPACE). After 12 weeks, training only the parents — without the child ever entering therapy — produced equivalent reductions in child anxiety.
Trinity College Dublin researchers analyzed 84 toddlers playing one-on-one with each parent. Mothers and fathers produced similar quantity and complexity of speech — but used different word sets, exposing children to a partly overlapping, partly different vocabulary menu.
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.