Preschool children are usually not diagnosed with ADHD, but they can show the symptoms while in preschool and teachers begin with early intervention while teaching them.
Yfirleitt fá börn ekki ADHD greiningu í leikskóla en þar vaknar oftast grunur um röskunina og kennarar hefja snemmtæka íhlutun (e. early intervention) í kennslu með börnunum.