When to Start Baby Sign Language

My daughter was seven months old the first time she signed "milk" back to me. It wasn't perfect. Her little fist opened and closed loosely, more like a squeeze than the actual sign. But she looked right at me while she did it, and I knew exactly what she meant.

That was the moment I stopped wondering whether baby sign language was worth the effort.

What is baby sign language?

Baby sign language uses simplified signs, mostly borrowed from American Sign Language (ASL), to communicate with hearing babies before they can speak. It's not a replacement for talking. It's a bridge.

You say the word out loud while making the sign. Your baby learns that a specific hand movement means a specific thing. Eventually they use that movement to tell you what they want, what they see, or how they feel.

Montessori programs, speech-language pathologists, and early childhood educators around the world use baby signing. It's not fringe. It's not new. It works.

The ideal age to start: 6 to 8 months

Most experts recommend introducing signs around 6 months. At this age, your baby's motor skills are developing fast. They can grasp objects, they're starting to point, and they're paying close attention to what you do with your hands.

Cognitively, something important is happening too. Around 6 months, babies begin developing object permanence. They start understanding that things (and words, and signs) represent real things in the world.

If you start earlier, say around 4 or 5 months, that's fine too. Your baby won't sign back yet, but they're absorbing everything. Think of it like speaking to a baby who hasn't said their first word. You don't wait until they can talk to start talking to them.

Most babies produce their first sign between 8 and 12 months. The gap between when you start and when they sign back is not wasted time. They're learning.

5 signs your baby is ready

You don't need to wait for a specific birthday. Watch for these cues:

Sustained eye contact during interaction. When you talk or play with your baby, they hold your gaze. They're tuned in to you.

Pointing at objects or people. This is huge. Pointing means your baby understands that directing your attention toward something can communicate a message. That's the same cognitive leap signing requires.

Waving bye-bye or clapping. Any imitative gesture shows your baby can watch a hand movement and reproduce it. That's literally what signing is.

Showing interest when you demonstrate a sign. If you sign "milk" before feeding and your baby stares at your hands or gets excited, they're connecting the sign to the meaning.

Reaching for things they want. Reaching is an early form of communication. Your baby is already telling you "I want that." Signs give them a more specific vocabulary for those requests.

If you're seeing two or three of these, your baby is ready.

Is it too late to start after 12 months?

Not even close. Older babies often pick up signs faster than younger ones because their motor skills and cognitive development are further along. A toddler between 12 and 18 months can learn 5 to 10 signs in just a few days.

Signs also remain useful well after first words appear. Toddlers who can say a handful of words still have dozens of things they want to express. When your 14-month-old says something you can't quite understand, having a sign to clarify makes the difference between connection and frustration.

I've met parents who started signing with their 16-month-old and saw results within a week. There is no window you've missed.

How to start: a simple 3-step method

I tried to teach six signs at once when I first started. It was too much. For me, not for my daughter. I couldn't keep track of which signs I was supposed to be using when.

Here's what actually works:

Step 1: Choose one high-motivation sign. Pick something your baby wants multiple times a day. "Milk," "more," and "all done" are the classic starters because they come up at every single meal.

Step 2: Use it consistently in context. Every time you offer milk, sign "milk" while you say the word. Every time your baby finishes eating, sign "all done." The key is repetition in the right moment, not drilling.

Step 3: Wait. Give it one to two weeks. Watch for approximations, not textbook-perfect hand shapes. Your baby's version of "more" might look nothing like the ASL sign, and that's completely normal. If they make a consistent gesture in the right context, they're signing.

Once that first sign clicks, add a second. Then a third. Most families build to 5 to 10 active signs within the first month or two.

Common mistakes to avoid

Teaching too many signs at once. Start with one. Seriously. It's tempting to download a chart of 25 signs and introduce them all, but you'll burn out before your baby has a chance to absorb any of them.

Expecting exact hand shapes. A baby's "more" might look like clapping. Their "milk" might look like they're grabbing at the air. Babies approximate. Their fine motor skills are still developing. Recognize the intent, not the form.

Giving up after a week. Research by Goodwyn, Acredolo, and Brown in 2000 showed that signing babies had larger vocabularies at both 24 and 36 months. But those results required patience up front. Babies need time to process before they produce. If you stop signing after five days because nothing happened, you quit during the most important part.

What to expect in the first month

Week 1 to 2: You'll feel like you're signing into the void. Your baby may not react to the signs at all. This is normal. They are watching and storing.

Week 2 to 3: You might notice your baby staring at your hands more intently. They may get excited when they see a sign they associate with something they like. Recognition comes before production.

Week 3 to 4: Many babies produce their first approximation of a sign during this window. It might be subtle. Pay close attention during meals and play. The first sign is easy to miss if you're expecting something dramatic.

Some babies take six weeks. Some take two. The timeline depends on age, temperament, and how consistently you use the signs. All of those timelines are normal.

The research behind it

This isn't just anecdotal. Linda Acredolo and Susan Goodwyn began studying baby sign language in the 1980s. Their landmark study with Claire Brown, published in 2000, followed signing and non-signing families over several years. The signing group had significantly larger vocabularies at 24 months. That advantage held at 36 months.

Vallotton's 2012 research added nuance: babies use signs as "placeholders" while they build verbal language. The signs don't compete with words. They scaffold them. Every time you sign and speak simultaneously, you're doubling the language input your baby receives.

No credible study has found that baby sign language delays speech. The evidence consistently points the other direction.

Ready to start?

You don't need a class. You don't need to be fluent in ASL. You need one sign, a few meals' worth of consistency, and a little patience.

Pick "milk" or "more." Use it today. In a few weeks, your baby might just tell you something back.

FirstEcho gives you a personalized daily plan based on your baby's age, with short video demos for every sign. Try it free.