[ID: A video of a small child in a tiled room. The child successfully kicks a red soccer ball. Smiling widely, open-mouthed, the child raises both arms over their head, fingers spread, initially. Adult voices say encouragingly “Wow!” and “Yaaaay!”
The child pulls their arms down, forefingers now raised, and seriously examines their hands, curling plump baby fingers in with concentration, and lifting thumbs instead, one at a time. The child checks to confirm that each hand holds up the intended digit, then beams again and raises their arms overhead once more, giving a double thumbs up. The child offers their own baby-voiced “Yaaa(y)!” joined by the adults’ voices, now with gentle giggling added in. /end ID]