The pincer grip, before anything else
Holding a pencil between thumb and index finger, resting on the middle finger, takes a coordination that builds slowly. Before 3, many children hold the marker in a full fist: it is common, and it is not to be corrected by force. A short, wide marker is easier to take in a pincer grip than a long pencil, simply because there is no room to close the hand around it.
The wrist follows, later
At first the movement comes from the shoulder: the whole arm sweeps the sheet, and the strokes are long and stiff. Little by little it moves closer to the hand — the forearm settles on the table, then the wrist takes over. That shift is what makes filling a small area possible, and it happens at its own pace, with little anyone can do to hurry it.
A circular stroke is not a line
Filling by turning means changing direction without lifting the pencil: harder than a back-and-forth in a straight line, and it comes later. Pages with large round areas — a mane, a sky, a snail’s shell — leave room for that stroke. Suggesting to “make circles” in a background often works better than asking for neat coloring.
Going over the lines doesn’t matter before 4
Staying inside the lines means seeing the edge, anticipating the stop and braking the movement: three things that fall into place together, and rarely before 4. Pushing earlier turns a quiet moment into a failed exercise. A page where the sky runs over the house is a successful page: the child filled it, which is exactly what there was to do.
