When Do Babies Start Cooing? A Speech-Language Pathologist Explains Your Baby’s First “Conversations”

Most babies start cooing between 6 and 8 weeks of age, although some begin a little earlier or later. By about 3 months, many babies are having delightful back-and-forth “conversations” with the people they love.

Those soft “oohs,” “aahs,” and “goos” are much more than adorable. They’re your baby’s first attempts at communication and an important step toward talking.

After more than 40 years as a speech-language pathologist, cooing remains one of my favourite developmental milestones because it’s often the first time babies discover that making a sound brings a loving response from someone they trust.

Let’s look at when babies start cooing, what these early baby cooing sounds mean, and—most importantly—how to coo back in ways that help your baby’s language grow.

What Is Cooing?

Cooing is the gentle, vowel-rich sound a baby makes when they’re content—think “ooh,” “aah,” “coo,” and “goo.” It’s different from crying (which comes first) and from babbling (which comes later). Where crying says, “I need something,” cooing says, “I’m happy, and I’m playing with my voice.”

Those easy vowel sounds are your baby experimenting with their own voice—discovering they can make sounds on purpose. It’s the vocal equivalent of a baby waving their hands around and realizing, “Hey, those are mine!”

The Cooing Timeline: What to Expect Month by Month

Birth to 6 Weeks: Crying and Early Sounds

At first, your baby communicates mainly by crying, along with grunts, sighs, and little throaty noises. This is completely normal and an important part of early communication.

6 to 8 Weeks: The First Coos

Around this time, you’ll begin hearing those first melodic “ooh” and “aah” sounds, often when your baby is calm, comfortable, and gazing at your face.

This is when many parents first wonder, “Is my baby trying to talk to me?”

In their own way, the answer is yes.

2 to 4 Months: Real “Conversations”

Baby cooing becomes more frequent—and much more social.

These back-and-forth exchanges are your baby’s first conversations, long before they say their first words.

4 to 6 Months: Babbling Begins

Gradually, consonants begin joining those vowel sounds. Cooing blossoms into babbling:

• “bababa”
• “dadada”
• “mamama”

Cooing doesn’t suddenly disappear—it simply grows into richer, more speech-like sounds on the road to first words.

What’s the Difference Between Cooing and Babbling?

Parents often wonder whether their baby is cooing or babbling.

Cooing usually begins around 6 to 8 weeks and is made up mostly of long vowel sounds like “ooh,” “aah,” and “goo.”

Babbling usually starts around 4 to 6 months. Babies begin combining consonants and vowels into repeated syllables like “bababa,” “dadada,” and “mamama.”

Both are exciting language milestones, but babbling is one step closer to real speech.

Why Cooing Matters So Much

Cooing isn’t just a cute stage you’ll look back on in family videos. It’s the foundation of language.

Every time your baby coos and you respond, something important is happening.

• They practice coordinating their lips, tongue, jaw, voice, and breathing. These early vocal experiments help your baby learn the movements they’ll later use to produce words.
• They learn what their own voice sounds like. As babies listen to themselves, they begin discovering that they can make different sounds on purpose.
• They hear language when they’re most ready to listen. When you repeat your baby’s coos and then add a few simple words, you’re giving them language at exactly the moment they’re paying the most attention.
• They learn that communication works. Your baby discovers that making a sound brings a warm, loving response.
• They learn the rhythm of conversation. Coo… pause… respond… repeat. Those tiny back-and-forth exchanges are the beginning of turn-taking—the foundation of every conversation your child will ever have.

Researchers even have a lovely name for this responsive back-and-forth: serve and return.

Those tiny back-and-forth exchanges build the brain connections that language is built on.

How to “Coo Back” and Grow Your Baby’s Language

You don’t need special toys or lessons—just your face, your voice, and a few unhurried minutes.

Some of the best opportunities happen naturally during your day. If your baby wakes up happy and quietly cooing, spend a few minutes “chatting” before lifting them from the crib. Diaper changes, getting dressed, and bath time are all wonderful times to enjoy little cooing conversations.

Whenever your baby is calm and alert, remember this simple pattern:

• Get close and face to face. Babies coo most when they can clearly see your eyes and mouth—about 8 to 12 inches away.
• Copy your baby’s sound. If your baby says “ooh,” say “ooh” right back using a warm, sing-song voice. Babies love being imitated.
• Then pause and wait. This may be the most important step. Give your baby several seconds to take another turn. If we fill every silence, our babies never get a chance to “talk.”
• Respond with delight. Smile. Light up. Answer their coo. You’re teaching your baby that their voice matters.

A few short, joyful conversations each day can make a real difference.

Don’t worry if your baby doesn’t coo right away. Asking your baby to coo on cue is a bit like asking someone to laugh on command—it doesn’t always happen! If your baby isn’t interested, simply try again later.

Often the best approach is to wait until your baby coos first and then join the conversation by cooing back.

What If My Baby Isn’t Cooing Yet?

First, take a breath.

Babies develop on their own timelines, and there’s a wide range of normal.

A baby who is a week or two behind a milestone chart is often doing just fine, especially if they’re alert, making eye contact, smiling, and responding to your voice.

One of the first things I’d think about if a baby isn’t cooing is hearing.

Most babies born in North America have their hearing screened before leaving the hospital. However, babies can sometimes develop temporary fluid behind the eardrum after birth or during an ear infection. If sounds are muffled, babies may be less interested in experimenting with their own voices.

That said, you know your baby best, and it’s always okay to mention your concerns to your doctor.

I’d suggest bringing it up if:

• your baby isn’t cooing or making sounds beyond crying by around 3 to 4 months
• your baby doesn’t seem to react to sounds or your voice
• your baby rarely makes eye contact or facial expressions
• your baby started cooing but then stopped

None of these automatically mean something is wrong. They simply deserve a conversation with your healthcare provider.

One Thing You Can Do Today

The next time your baby coos, repeat the sound back.

Then wait.

Some babies are naturally quiet observers, but that doesn’t mean they aren’t learning. Keep talking, singing, reading rhymes, and enjoying everyday moments together.

If your baby isn’t yet ready for back-and-forth cooing, you can still enjoy turn-taking through games like Peek-a-Boo, Pat-a-Cake, gentle tickles, or simply smiling back and forth.

These playful interactions are building the same communication skills.

A Thought from Cheryl

Parents sometimes tell me they feel a little silly talking to a two-month-old who can’t answer with words.

Please don’t.

You are your baby’s first and most important teacher, and their brain literally lights up when you respond to their sounds with warmth, smiles, and “parentese.”

When you coo back to your baby, pause, and wait, you’re teaching one of the most important lessons of early communication:

Every coo you return is another brick in the foundation of a lifetime of communication.

The Bottom Line

Most babies start cooing around 6 to 8 weeks, and by 3 to 4 months those soft little sounds often become delightful back-and-forth conversations.

It may look like simple play—and it is—but it’s also the beginning of language.