The Moment Your Toddler Stops Improvising and Starts Planning

At around 18 months, something changes in the way your toddler approaches a pile of bricks.

Before this point, the interaction is largely sensory and motor: the click of two bricks fitting together, the satisfaction of stacking one on top of another, the pleasure of knocking a tower down and starting again. The child is learning through action.

Then, gradually, a second layer appears. The child looks at what they want to build before they touch a brick. They hold up a brick, look at the structure, and try something specific. The action becomes directed.

This is not a small shift. This is the beginning of planning — and the cognitive implications extend far beyond brick play.

What the research says about toddler problem-solving

ZERO TO THREE, the organisation that tracks early childhood development milestones, describes the 18–24 month window as the period when toddlers begin to use "thinking and physical skills to solve complex problems by creating and acting on a plan to reach a goal."

Concretely: if a toddler wants to reach a toy on a shelf and there's a brick on the floor, they will now pick up the brick, carry it to the shelf, place it under the toy, and retrieve it. This sounds obvious. It is, in fact, a profound cognitive achievement. It requires the child to hold the goal in mind, identify a missing intermediate step, and execute a sequence of actions they have not performed in exactly this way before.

Block play at this stage — when the child begins to plan before acting — is directly associated with later executive function performance. A 2021 study published in Developmental Science found that pre-schoolers with higher planned block play complexity showed stronger executive function scores, even controlling for general cognitive ability.

The difference between cause-and-effect and goal-directed action

There is an important distinction worth naming. Cause-and-effect understanding — "if I push this brick, it falls" — is present from well before 18 months. This is the infant discovering that the world responds to their actions. It is fundamental and important, but it is not planning.

Goal-directed action — "I want to build this specific thing, and I need to figure out how" — requires the child to hold a mental representation of a future state and work backward from it. This is what researchers call working memory in its early form: the ability to hold information in mind and use it to guide action.

Brick play is one of the few play activities that naturally demands this. A child painting a picture has no objective standard to compare against. A child following a grown-up's instruction is executing, not planning. But a child building a bridge between two toy cars has a goal — and the gap between the two cars creates an immediate, concrete problem that demands a solution.

Why this matters for school readiness

Parents often think about school readiness in terms of letters, numbers, and colours. The research is consistent that these are less predictive of school success than the underlying cognitive skills that allow learning to happen: working memory, inhibitory control, and cognitive flexibility.

Planning a brick structure exercises all three. The child must hold the goal in mind (working memory), resist the impulse to just stack randomly (inhibitory control), and adjust when the structure doesn't work as expected (cognitive flexibility).

The benefit is not that bricks teach geometry. It is that bricks require the child to think before acting, notice when their plan isn't working, and generate alternatives — all in a context that is intrinsically motivating and low-pressure.

What to do with this

Notice the pause. When your toddler stops and looks at the bricks before touching them, resist the urge to fill the silence. That pause is cognitive work. Let it happen.

Ask what they're making. Not "what is that" (which invites a label) but "what are you making" (which invites intent). The question forces the child to hold the goal in mind and articulate it — a form of self-distancing that strengthens planning.

Present real problems. Two toy animals on either side of a gap, a ramp that needs a support structure, a tower that's too narrow for the figurine at the top. Brick problems that have a functional purpose — not just aesthetic — engage planning more deeply than free building.

Let them fail and restart. The parent who swoops in to fix a collapsing structure removes the problem-solving opportunity. "It fell. What do you want to try differently?" is a more useful response than immediate repair.

The short version