Almost everything commonly said about children's attention spans is either unmeasured or wrong, including the statistic you've probably seen. There's still something real to discuss, and it isn't a decline in children's capacity to pay attention.
The statistic isn't real
The widely circulated claim that human attention spans have fallen to a few seconds, shorter than a goldfish's, has no credible source behind it. It's been traced and debunked repeatedly and it continues to circulate because it confirms something people already believe.
There's no good evidence that children today are less able to concentrate than children thirty years ago. That's worth knowing before accepting the premise of the conversation.
What is actually happening
Not capacity. Practice and competition.
Any child capable of playing a long video game, building something elaborate, or watching three episodes of a series has substantial attention capacity. The capacity is intact.
What's changed is how often sustained, unrewarded attention gets practised. Reading a novel offers no feedback for long stretches — no score, no new stimulus, nothing happening for pages. That particular kind of attention is a trained thing, and it's trained by doing it.
Meanwhile the alternatives have become extremely good at being immediately rewarding. A chapter competes with short-form video, and it competes badly on the dimension of immediate reward while winning on nothing a tired eleven-year-old is weighing.
Interruption is the bigger factor
More than any shift in children, the conditions have changed.
Reading something long requires continuous time. A child with a phone nearby is interrupted every few minutes, and sustained reading in an interrupted environment is close to impossible — not because they can't concentrate, but because they aren't being allowed to.
This is encouraging, because it's a condition rather than a trait, and conditions can be changed.
Building it back
Protect a continuous stretch. Twenty minutes with nothing available to interrupt. The uninterrupted part matters more than the length.
Expect the first ten minutes to be unpleasant. Settling into a long text takes time, and a child who stops after four minutes hasn't failed — they've quit before the part where it becomes absorbing. Knowing this is useful to say out loud to them.
Series and long books help. Momentum carries attention. A child twelve books into a series is practising sustained reading without noticing.
Audiobooks count here too. Following a long story is the relevant skill, and listening trains it.
Read aloud to them. Being read to for half an hour is sustained attention to a long narrative, with the decoding burden removed. One of the better ways to build the habit.
What doesn't help
Removing all short-form content and expecting reading to fill the gap. It generally doesn't — it produces a bored child who resents books.
And lecturing them about attention spans, using a statistic that isn't true.
The reframe worth having
The question isn't whether your child can concentrate. It's whether anything in their week asks them to concentrate on something that isn't immediately rewarding — and whether, for twenty minutes, they're left alone long enough to try.