How Walking Made Us Human — Part IV: From First Steps to First Words

Somewhere around her first birthday, a baby starts pointing — not to grab, but to make you look too. That's sharing, before the first word. And it turns up just as she's finding her feet.

Somewhere around her first birthday, a baby does something no other animal's infant reliably does.

She points. Not grabbing, not reaching for a thing she wants in her fist — pointing. One finger extended at a passing dog, then a glance back at you, to check that you're looking too. She doesn't want the dog. She wants you to see the dog with her. There is no other reason for the gesture at all.

And here's the part worth sitting with: she's also, right about now, just started to walk. Within a few more weeks or months, the first real words arrive. Standing, stepping, pointing, speaking — all crowding into the same short stretch of a single year.

The whole series so far has been about deep time: how standing up over millions of years freed the hands (Part I), wired movement into thought (Part II), and left us the only biped that kept its hands off the ground for good (Part III). This one shrinks the timescale to twelve months. Because you can watch that entire evolutionary package assemble itself — in order — in one human being learning to be one.

The order is (almost) always the same

Babies vary enormously, and the ages below are rough. But the sequence is remarkably stubborn.

First they pull themselves upright and cruise along the furniture, hands still gripping for support. Then the hands let go and the first wobbling steps happen — for many babies somewhere around twelve months. And clustered right there, in the same window, comes the index finger: pointing to ask, and then, tellingly, pointing just to share. First words tend to follow within weeks or a couple of months, then a slow build and, later, an explosion.

Standing frees the hands. Free hands start to point. Pointing opens onto words. You are looking at the same chain Part III laid out — full-time bipedalism, retired forelimbs, a hand with nothing to carry — except here it isn't playing out over seven million years. It's playing out over one birthday.

A point is not a grab

It's easy to miss how strange pointing is, because every human does it and we assume it's obvious. It isn't.

Reach into the animal kingdom and you'll find plenty of pointing to get — a gesture that means give me that. What you almost never find outside our species is pointing to share: look at that, isn't it interesting, let's attend to it together. Great apes, even ones raised among humans, point to request far more than they point simply to direct another mind's attention for its own sake. The psychologist Michael Tomasello has spent decades on exactly this line, and it's a fine one, easy to overstate — but the asymmetry is real. Sharing attention, with no payoff but the sharing, is where humans quietly go their own way.

That shared-attention move even has a name: joint attention — the three-way triangle of me, you, and a thing we're both looking at, each of us aware the other is looking too. It sounds trivial. It is the ground floor of language. A word is useless until two minds can agree on what it's pointing at, and the pointing finger is how a pre-verbal baby first strikes that agreement. Long before she can say dog, she can get you and her locked onto the same dog. The word just moves into a room the finger already built.

Why standing up starts the clock

You might think walking and talking are simply two things babies happen to do in the same year — the calendar, not a connection. The evidence says otherwise, and the mechanism is almost embarrassingly physical.

A crawling baby's hands are busy. They're floor. They hold her up, and her eyes point mostly at the carpet a few inches ahead. Stand her up and everything changes at once: her hands come free, her head lifts, and the whole room opens in front of her. And the first thing she does with those free hands and that new vantage is bring the world to other people — carrying a toy across the room to drop it in your lap, holding it up, showing it off. In one careful study, infants who had just started walking carried and shared objects with their mothers far more than same-age babies still crawling (Karasik and colleagues, 2011). Upright, mobile, hands-free — she becomes a delivery service for shared attention.

And the language tracks it. When researchers followed babies across the crawl-to-walk transition, the new walkers understood and produced more words than you'd predict from their age alone — the jump lined up with learning to walk, not with the birthday (Walle & Campos, 2014). Walking doesn't magically install vocabulary. It rearranges a baby's whole relationship to the people around her — more showing, more sharing, more back-and-forth — and language grows in exactly that soil.

From the hand to the mouth

Zoom back out to evolutionary time and the same suspicion appears, much older and much harder to prove.

Long before speech, our ancestors had freed, dexterous, endlessly gesturing hands — the ones Part III was about. A number of researchers have argued that manual gesture was language's first draft: that meaning was pointed and mimed before it was ever spoken, and that speech later grew up alongside a communication system the hands had already opened. It's suggestive that Broca's area, a patch of brain we file under "speech," is also deeply involved in sequencing complex manual actions — as if talking borrowed circuitry that hands broke in first. It rhymes with Part II's core finding: in us, moving and meaning were never wired apart.

That is a hypothesis, not a settled fact — flag it clearly. Language leaves no fossils, and how it began is one of the genuinely open questions in science. But the developmental echo is hard to ignore. Every baby, in her own first year, does seem to travel the same road the hypothesis describes: from the freed hand, to the pointing finger, to the shared gaze, to the word.

Careful here: a baby is not a fast-forward of evolution

This is the spot where the story wants to run away with you, so let's pin down what it does not say.

It does not say a child re-runs human evolution in her first year. That old idea — "ontogeny recapitulates phylogeny" — was overstated a century ago and never recovered; a baby learning to walk is not a little australopithecine, and her first point is not a re-enactment of anything. What the developmental sequence actually shows is subtler and more interesting: in our species, locomotion and communication are built so tightly into each other that they come online together, on the same wiring, under the same push — the coupling Raichlen and Alexander traced across the motor and cognitive brain.

And notice which piece is the special one. It isn't the walking. Lots of animals walk, and some, as we've seen, walk better. The rare thing is what a freed, upright, hands-open primate did with the attention that came free alongside — she started pointing things out to other minds for the sheer sake of sharing them. Walking opened the door. Joint attention, and the language that moved in behind it, is what walked through.

First steps, first words

Trace the whole series and it collapses into something you can watch happen on a living-room floor. A body stands up and the hands come free. Free hands reach out — not to grab, but to show. Showing becomes sharing, sharing becomes words, and a creature that started out just trying to move across a landscape ends up able to hand its thoughts to another mind.

It took evolution millions of years. It takes a baby about one. Same order, same logic, wildly different clock.

We've now followed walking from the savanna, through the brain, past every other animal that moves, and into the making of a person who can speak. Which leaves the last and most personal question of all — the one that matters if you're reading this sitting perfectly still. What is all of this doing, or failing to do, for the body you're living in today? That's Part V.