Somewhere in the folklore of parenting there is a formula: a child can concentrate for one minute per year of age. It appears in leaflets, in training courses and in the confident advice of strangers. It has no research basis whatsoever, and it survives because it is memorable and because it sounds like the kind of thing that would be true.
It also encodes an assumption worth digging out, which is that attention is a quantity a child possesses, more of it arriving each birthday. That is not what attention is.
Two ways of directing attention
The most useful distinction in this area is between attention that is captured and attention that is held.
Captured attention is driven by the stimulus. Something moves, makes a noise, or is unexpected, and attention goes there without any decision being made. It is fast, automatic and present from very early in life.
Held attention is driven by a goal. You decide what matters, and you keep attending to it while other things compete. This requires maintaining an intention over time and suppressing responses to whatever else is happening.
Adults do both, and switch between them constantly. Young children do a great deal of the first and rather little of the second, and the balance shifts slowly over years rather than in a step at any particular age.
Why interruptibility is the right design
It is tempting to read the young pattern as an immature version of the adult one, waiting to improve. There is a better reading.
Consider what a two year old's job is. They do not know what the world contains. Almost everything is potentially informative, and they have no reliable basis for deciding in advance what will matter. Under those conditions, a system that stays locked onto a chosen target is a system that misses most of what is available.
An adult, by contrast, mostly knows what is in the room and has goals worth protecting. Filtering is valuable to them and expensive to a child.
So the young pattern is not a broken adult system. It is the appropriate configuration for an agent whose priority is coverage rather than completion. This has been argued at length in the developmental literature and it reframes a great deal of everyday exasperation.
Which is why the long absorption is not a contradiction
Every adult who has said that children cannot concentrate has also watched a three year old spend forty minutes on a puddle.
These are not in tension once you separate the two systems. The puddle is self chosen and continuously informative: it changes when acted on, and every action produces new information. There is no intention to hold, because the activity supplies its own direction moment to moment.
The imposed task is the reverse. It requires holding somebody else's goal, it does not respond in interesting ways, and the child has no stake in its completion. The same child fails one and sustains the other, and the difference is in the task, not the child.
This is why observed attention varies so enormously with setting, and why a snapshot in one context predicts so little about another.
What actually develops
Several partly separate things, on different timetables.
Resisting distraction. The capacity to keep going when something else is competing improves steadily through childhood and is still improving well into adolescence.
Holding a goal. Remembering what you were supposed to be doing after an interruption depends on working memory, which we describe in working memory in plain words.
Switching deliberately. Moving attention on purpose, rather than being moved, develops later than either of the above.
Knowing your own attention. Noticing that you have drifted and bringing yourself back is a late development, and plenty of adults have not finished it.
These do not arrive together, which is one reason a child can look advanced on one and unremarkable on another.
Where this collides with school
The uncomfortable part. Formal schooling in England begins earlier than in most European systems, and the reception year asks four and five year olds to hold imposed goals for stretches at a time. The mismatch between what is asked and what is typical at that age is not a claim about individual children; it is a structural fact about the system, which we take up in how the reception year works.
Good early years practice manages this by shortening imposed sequences, alternating them with self directed activity, and treating restlessness as information about the task. The statutory early years foundation stage framework and the accompanying non statutory guidance are built around child initiated activity for exactly this reason.
Where it goes wrong is when age typical behaviour is read as a characteristic of the child. A four year old who cannot sit for twenty minutes is telling you about four year olds.
The claim that attention spans are collapsing
You will have seen the figure claiming that human attention span has fallen below that of a goldfish. It is not a real finding. It has no traceable source, it has been repeatedly investigated and found to originate in nothing, and it continues to circulate because it is a good line.
The serious question underneath is whether media environments change habits of attention, and that is genuinely open. It is also much harder to answer than the confident version implies, for reasons we set out in screens as an evidence question.
What can be said is that comparing today's children with a remembered version of previous generations is not evidence, and that the tests used to measure attention in laboratories have not shown the collapse that the discourse assumes.
What a reader can take from this
That a small child's attention is organised for coverage rather than completion, and that this is fit for purpose. That the minute per year formula is invented. That attention observed in one setting says little about another. And that the mismatch between what small children do and what institutions expect is a fact about the institutions as much as about the children.
None of which tells you anything about a particular child, and this magazine will not pretend it does.