When Do Babies Start Babbling

Babbling has stages, and each one has an age

"Babbling" gets used for everything from a two-month-old's vowel noises to a ten-month-old's fluent nonsense sentences. The published milestones separate them, which is why the ages you see quoted seem to disagree.

The CDC's revised checklists lay out the sequence: "makes sounds other than crying" at two months; "makes sounds like 'oooo' and 'aahh' (cooing)" and "makes sounds back when you talk to him" at four months; "takes turns making sounds with you", "blows 'raspberries'" and "makes squealing noises" at six months; and "makes different sounds like 'mamamama' and 'babababa'" at nine months.

Those ages come from the 2022 revision, produced by an American Academy of Pediatrics expert group and published in Pediatrics. Every item now sits at the age by which "most (≥75%) children would be expected to demonstrate the milestone", replacing the older median-age approach. So nine months is not when babbling starts; it is roughly when three in four babies are doing the consonant-string version.

What the other bodies say

ASHA, the American speech and language professional body, puts cooing at birth to three months, "vocalizes different vowel sounds — sometimes combined with a consonant" and blowing raspberries at four to six months, and "babbles long strings of sounds, like mamamama, upup, or babababa" at seven to nine months.

The HSE's month list puts chuckling and echoing sounds at three months, "ah-goo" sounds at four months, raspberry sounds at five months, and "babbling sounds such as 'baba' and 'gagaga'" at six months, adding that a baby of that age will "enjoy talking back and forth with you using different cooing and babble noises". At seven months it describes "random babbling sounds", and at eight months babbling "put together in a way that sounds like adult speech".

The AAP places the start earlier still: "At about four months, she'll start to babble, using many of the rhythms and characteristics of her native language." It notes you can hear a baby "raise and drop her voice as if she were making a statement or asking a question" long before there are any words in it.

Why babbling matters more than first words

Babbling is where a baby practises the machinery: breath, voice, tongue, lips, and above all turn-taking. The CDC's six-month item is not a sound at all — it is "takes turns making sounds with you". That back-and-forth is the shape of conversation arriving before any of the content.

It is also a hearing test you run every day. The AAP makes the link explicit: a baby who does not babble or imitate sounds may have "a problem with her hearing or speech development", and warns that partial hearing loss can be missed because such a baby "still can be startled by loud noises or will turn her head in their direction, and she may even respond to your voice" while having "difficulty imitating speech".

What helps

Responding. The HSE's advice for nought to twelve months is to "get face to face, make eye contact and smile", to "copy their sounds and actions", to "repeat words to help them understand", and to "leave little pauses for them to take their turn". The NHS says the same in its own words: repeat the sounds your baby makes back to them, because it "teaches your baby lessons about listening and taking turns in a conversation".

The AAP adds a nice trick: when your baby lands on a sound, feed it back with words that contain it. "If her sound of the day is 'bah,' introduce her to 'bottle,' 'box,' 'bonnet'."

Both the HSE and the NHS also say to turn off background noise. The HSE: "turn the TV and radio off when playing and talking to them – background noise can be confusing and overwhelming."

When not babbling is worth raising

The AAP gives the clearest single threshold: "If she doesn't babble or imitate any sounds by her seventh month, it could mean a problem with her hearing or speech development... If your child does not babble or produce a variety of sounds, alert your pediatrician."

The HSE gives earlier ones for the stages before babbling: contact a GP or public health nurse if by one month your baby does not "startle to loud noises"; if by four months they do "not coo or make sounds"; if by five months they do "not chuckle or laugh". The CDC checklist's own logic applies at nine months: a baby not making sounds like "mamamama" by then is in the quarter of children the checklist is designed to prompt a conversation about.

And the trigger that overrides all of them, repeated at every month of the HSE's first-year list: contact someone if "your child loses skills they had before". A baby who was babbling and has stopped should be reported rather than watched.

Prematurity, ear infections and two languages

Correct for prematurity: a baby born two months early has a corrected age two months behind their birth age, and that is the age to compare against. The AAP advises adjusting until two years.

Repeated ear infections matter here. The AAP notes that a baby with frequent ear infections "might have some fluid remaining in her inner ear, and this could interfere with her hearing", which in turn shows up as delayed babbling.

Two languages at home do not delay babbling and are not a reason to simplify. The NHS is direct: "talk to your child in whatever language feels comfortable to you", and knowing another language "will help the development of their English".