Does Baby Sign Language Help Speech? Here's the Research

Somewhere around the ten-month mark, communication breaks down in a very specific way. The wants are genuinely complex now — there's a preferred cup, an opinion about the snack, a specific toy visible on the shelf — but the words haven't arrived yet. The result is a small person standing at the kitchen cabinet, vibrating with intention, making the kind of sound that carries through walls and into neighboring apartments.

Baby sign language promises to bridge that gap. A set of gestures. The reassuring claim that babies who sign also talk sooner, score higher on IQ tests, have fewer meltdowns. Here's what the research actually says about whether any of that is true.

The one-sentence answer: Baby sign language won't accelerate speech development, and the largest study to date found no meaningful effect on vocabulary — but signing reduces pre-verbal frustration and supports the attentive back-and-forth that benefits communication during the 8-to-14-month window when the wants are real and the words aren't there yet.

A quick map of what's below:

• What "baby sign language" actually is, and why the name slightly overpromises
• What the largest study in this field, published in 2026, found that most signing resources won't tell you
• The genuine benefits the research does support, and why the timing matters
• When to start, what to expect, and why early results take longer than it feels like they should
• The seven signs most useful for daily life, with how to teach each one
• How signing connects to spoken language, and what helps the transition when words arrive

If the one-sentence answer above is enough, you've got the gist. If you want the mechanism (the actual studies, the honest summary of what signing does and doesn't do, and the practical guide to getting started), keep reading.

Baby sign language is a set of gestures, not a language

The name is a little misleading, and it's worth clearing up. Baby signing isn't a language — it's a set of simple hand gestures, usually ten to thirty of them, that parents teach alongside spoken words. The whole point is to give a baby a way to communicate before the mouth is ready to do the job.

And the mouth isn't ready for a while. Speech is remarkably complex: it requires coordinating the lips, tongue, jaw, and breath in precise sequences, everything firing together at the right moment. Babies get there, but it takes time. The hands, on the other hand, are capable of a lot earlier. Waving, clapping, pressing palms together — those movements show up months before reliable speech sounds do. The sign for more is essentially two hands pressing together, which a nine-month-old can absolutely do.

Baby signing borrows signs from American Sign Language (ASL), but it isn't ASL. ASL is a complete natural language with its own grammar and syntax, used by a community of native speakers. Baby signing programs take a handful of vocabulary items from ASL (or invent their own variations), pair them with spoken words, and leave all the grammar behind. That's simply what the practice is.

A 2022 study from Northwestern University found that hearing babies as young as 4 months already attend to sign-language input as if it were a communicative signal, well before they could produce any hand movement themselves (Novack, Chan, and Waxman, Frontiers in Psychology). The eyes are in before the hands. And both are in before the voice. This is part of why language development starts well before a first word. The foundations are being laid much earlier than the milestones suggest.

The question everyone asks is the wrong one

Most baby sign language resources spend most of their energy reassuring parents that signing won't delay speech. That's worth knowing — but the more interesting question is whether signing actually speeds up speech, which is what most programs promise.

In 2026, a team of researchers in France published the largest study ever done on this. They compared 723 babies who had been exposed to baby sign at home with 625 who hadn't, across 1,348 children total, aged 10 to 28 months, and accounted for family income and the full range of activities both groups engaged in. Their conclusion: "weak to no effect of baby sign on vocabulary development or caregiver behavior" (Bertussi, Ravanas, and Dautriche, First Language). Signing didn't set babies back. It also didn't push them ahead.

This matched what other researchers had been finding for years. A 2014 review by Fitzpatrick and colleagues looked at everything published on baby sign in hearing children up to age 3 and concluded the evidence for speech benefits was "unclear" — partly because many of the studies claiming big effects had real problems: tiny samples, no control groups, parents reporting on their own babies. The early NIH-funded research that started the whole baby signing movement, Acredolo and Goodwyn's work from 1988, was built on 16 babies and retrospective maternal recall. When later researchers ran more rigorous studies, the long-term language and IQ benefits didn't replicate.

So: signing doesn't delay speech, and the research on that is clear. The vocabulary acceleration that many programs advertise isn't well-supported by the evidence. What the research does show is more nuanced, and genuinely useful to know.

What signing actually does during this window

Here's where the research gets interesting.

Between about 8 and 14 months, a baby has real things to communicate (preferences, needs, strong opinions about the snack) but the mouth hasn't caught up yet. This gap is where most of the frustration lives, for everyone involved. A 2018 study by Konishi and colleagues (Infant Mental Health Journal) followed toddlers aged 11 to 28 months over several months in a signing childcare. They found that during stressful moments (end of meals, transitions, and separations), toddlers reached for gesture more often than speech, and that having a gestural vocabulary gave them more ways to manage those moments. It makes sense: a hand movement is easier to produce when upset than a word is, because it doesn't demand the same precise motor coordination.

The most rigorous study of baby sign in hearing babies is a 2013 randomized controlled trial by Kirk, Howlett, Pine, and Fletcher in Child Development, which followed families from when babies were 8 months to 20 months old. Language outcomes were the same across signing and non-signing babies. But something else turned up: mothers who had been taught to use symbolic gestures were noticeably better at tuning in to what their babies were communicating non-verbally. Researchers called this "mind-mindedness" — paying attention to what's going on inside the baby, not just reacting to surface behavior. Those mothers responded more specifically to what they read in the baby's signals.

That's not a small thing. The research on early language development keeps returning to the same finding: the most powerful ingredient is responsive back-and-forth between baby and adult. When a baby sends a signal and an adult notices and responds, that's what builds language circuitry over time. Signing gives babies more legible signals to send, and gives adults more concrete things to respond to. For more on how early communication builds from the ground up, the five senses development guide walks through what's happening in those first months before any gestures appear.

When to start and what to realistically expect

The sweet spot for starting is somewhere between 6 and 8 months. Before that, a parent ends up doing a lot of solo performance — the baby is watching, but production won't happen for months regardless. After that, it can feel like a race to get signs established before speech arrives and takes over. Starting at 6 months means there's enough runway to reach the first actual sign around 8 to 10 months, when intentional communication is really kicking in.

The part that surprises most people: most babies need about three to four months of consistent modeling before producing a sign back. Three to four months of making the sign for more at every single meal before anything appears. The Kirk and colleagues study documented this arc well, tracking babies from 8 to 20 months. Babies who started exposure earlier generally produced their first sign in the 8-to-10-month range; those who started later often hit signing and early spoken words at roughly the same time.

A few things that help to know in advance: babies tend to understand a sign for weeks before they produce it, so the modeling isn't going nowhere just because nothing is coming back yet. Early versions of signs look nothing like the adult version; pressing fists together instead of fingertips still counts as "more." And most babies drop signs fairly abruptly once the spoken word is ready to take over, which isn't a failure at all — that's exactly what's supposed to happen. The activities guide for 9-month-olds covers what else is happening developmentally during this window.

The first signs to teach: a practical baby sign language chart

The most useful starting point isn't the most technically accurate chart but the one that covers the situations where not being able to communicate hurts most. Seven signs cover most of the terrain.

More is made by pressing the fingertips of both hands together twice, like tapping them against each other in front of the chest. This is the sign most babies learn first, and it's worth the investment: mealtimes go noticeably smoother when a baby can say "keep going" without screaming. Early versions look like pressing fists together rather than fingertips, and that absolutely counts.

All done is made by holding both hands up with palms facing away, then rotating them toward you. It shows up most at the end of meals or activities, ideally before the meltdown that would otherwise announce the same news.

Milk is made by opening and closing one hand like squeezing something. A favorite to teach early because the gesture actually looks like what it means (milking a cow), which makes it a little easier for babies to catch on to, according to research on how hearing children acquire signs (Caselli and Pyers, Journal of Experimental Psychology, 2020).

Eat is made by bringing the fingertips of one hand to the lips twice, like eating from your hand. It pairs naturally with introducing solid foods.

Help is made by resting a thumbs-up hand on the open palm of the other, then lifting both hands together. One of the most versatile signs across many different situations.

Water is made by extending three fingers (index, middle, ring) into a "W" shape and tapping the index finger to the chin twice.

Please is made by rubbing an open palm in a circle on the chest. Last on the functional list, but high on the "parents want it early" list.

The key to all of them is consistency. Saying the word and making the sign together, every single time: that pairing is what lets both channels reinforce each other. Three signs used reliably every day work better than twenty signs used whenever anyone remembers.

When signs give way to words, and what helps that transition

Most babies who learn to sign start dropping individual signs as spoken words arrive, somewhere between 12 and 18 months. Once the mouth can produce a word reliably, the hand version becomes redundant. The spoken word travels further and works from across the room, which is a real advantage. So the hand version tends to quietly retire.

It happens one sign at a time, not all at once. A baby might stop signing milk weeks before more disappears, depending on which spoken word clicks into place first. There's often an overlap period where both the sign and the word show up together, the brain not having fully made the switch yet, so both versions are still active. That's not confusion; that's just the transition.

What helps is the same thing that helped the signs arrive: responding when a baby communicates and naming what's happening. When a baby signs cow at a picture, saying "cow — yes, that's the cow" builds the bridge between the gestural version they already know and the spoken word that's coming. The research on what actually drives language development keeps pointing here: it's the exchange that builds the wiring, not the vocabulary list.

For naming practice during this transition, our First Words flashcard sets cover five vocabulary categories (farm animals, ocean animals, dinosaurs, fruits and vegetables, and vehicles) built around exactly this kind of point-name-respond interaction. They fit well in the overlap period when signs and emerging words are both in play, because each card gives a natural naming target for the exchange.

The overlap doesn't last long. By 18 months, most signing has faded into spoken words. The habit of paying attention and responding tends to stick around, though.

When signing patterns are worth mentioning to a pediatrician

For the vast majority of babies, signing is a normal part of communication development that comes and goes. A few patterns are worth bringing up at a well-child visit.

If a baby reaches 12 months without pointing, waving, or any gestural communication at all — signing included — that's worth raising with a pediatrician. The CDC tracks pointing and showing as milestones at 12 months, and a baby who isn't doing either is worth a closer look, regardless of whether signing is part of the picture. This is different from a baby who is learning signs but not yet pointing spontaneously at interesting things — those two situations are distinct.

If signs disappear alongside other skills the baby had already developed (sounds, words, or other gestures), that kind of regression across several areas at once is a reason to check in. It's the kind of observation a pediatrician will want to hear about.

And for parents worried their baby is "behind" on signing specifically: there's no milestone for it. The timeline varies widely, and a baby who never takes to signing and moves straight to spoken words is developing exactly as expected. For the speech development timeline and what to watch for, the guide to when babies start talking has the full picture.

Signing is a tool. For some families and some babies, it makes a genuinely frustrating stretch a bit easier. For others, the window closes before the tool gets much use. Either is completely fine.