Pacifier and Speech Development: What the Evidence Shows

Parents ask this constantly: is the pacifier holding my child's talking back?

• Sleep-time use and all-day use are two different questions with two different answers.
• The best study on speech sounds found most speech outcomes unrelated to pacifier use (Strutt et al., 2021).
• The clearer risk is ears, not articulation. Restricting pacifiers cut acute ear infections by roughly a third in one trial (Niemelä et al., 2000).
• The AAP flags changes to mouth shape and bite when strong sucking continues past 2 to 4 years.

The short answer is a boring one. A pacifier used for naps and bedtime has very little speech evidence against it. A pacifier parked in the mouth through most of the waking day is a different object, and that is the version worth changing.

Quick Reference

Does a pacifier cause speech delay?

Probably not on its own, and the honest version of that sentence includes how thin the evidence is.

The most careful study to look specifically at speech sounds recruited 100 British children aged 24 to 61 months, asked parents about how long and how often the child used a dummy, then assessed the children's phonology with a standardised test. Most speech outcomes showed no significant association with dummy use, however it was measured. One association did show up: more atypical speech errors in children with greater daytime frequency of use. It was not there in the older half of the sample, above 38 months, which is consistent with those errors resolving over time. The authors' own summary is the line worth carrying around: the evidence base for any effect of dummy use on speech is very small (Strutt et al., 2021).

The study parents usually get quoted at them is older and smaller. A cross-sectional survey of 128 preschoolers in Punta Arenas, Chile, found roughly three times the odds of a speech disorder in children who had used a pacifier for three years or more, with a confidence interval running from 1.08 to 10.81 (Barbosa et al., 2009). A confidence interval that wide is a study telling you it is not sure. It also cannot separate cause from effect: a child who is harder to settle may keep the pacifier longer for reasons that have nothing to do with the pacifier.

So the mechanism people imagine, a plug physically deforming the tongue's habits, is not well demonstrated. In practice, a pacifier in the mouth also means fewer chances to babble and try out words, although studies have not so far shown that this particular mechanism is what causes a speech delay. If you want to make the most of those chances, our 7-day plan for encouraging talking is built around exactly that.

Ear infections are the better-supported link

This is where the research stops hedging.

A Finnish trial randomised 14 well-baby clinics: nurses at half of them were trained to counsel parents to limit pacifier use in children under 18 months. Continuous pacifier use dropped 21%, and acute otitis media per person-month was 29% lower at the intervention clinics. Children who did not use a pacifier continuously had 33% fewer episodes (Niemelä et al., 2000). A Dutch cohort of 495 children under four found an adjusted odds ratio of 1.9 for recurrent ear infections, confidence interval 1.1 to 3.2, while the odds for a single episode were not significant (Rovers et al., 2008).

Now connect the dots the way a speech therapist does. Repeated middle-ear fluid means intermittent, fluctuating hearing during the exact months a child is mapping sounds onto meanings. That gives a plausible indirect route by which a pacifier could affect speech: through the ear, and not necessarily through the tongue. If ear infections keep coming back, read our piece on ear infections in babies before you spend another month worrying about articulation.

Notice what the Finnish trial actually changed, though. Not "no pacifiers". Restriction to the moments of falling asleep.

What prolonged sucking does to teeth

The AAP is specific here in a way it is not about speech. Strong sucking on a pacifier, thumb or fingers beyond 2 to 4 years of age may affect the shape of the mouth and how the teeth line up. The reassuring half of the same guidance: if a child stops before the permanent front teeth come in, there is a good chance the bite corrects itself (AAP).

One more small thing that costs nothing. Never dip a pacifier in anything sweet, which the NHS names directly as a route to tooth decay (NHS). Do not dip it in anything.

Sleep-time use is a different question

Keep these two evidence bases apart, because parents get whiplash when advice blends them.

For safe sleep, the AAP position is to offer a pacifier at nap time and bedtime, because it is associated with lower risk of sudden infant death syndrome. If you are breastfeeding, wait until feeding is going well first, usually about 3 to 4 weeks. Nothing in the speech literature argues against that. The night-time use in the Strutt data was not the part associated with atypical errors.

That means the pacifier is genuinely useful for a while, and the useful window closes gradually. Sleep associations shift around the same age anyway, which is why weaning tends to go better when you are not simultaneously fighting bedtime. Our guide to toddler speech development covers what the talking side should look like as that first year closes.

When to cut back and when to stop

Stop counting whether the pacifier is "allowed" and start counting waking hours it spends in the mouth. Two children can both be described as pacifier users and be nowhere near each other.

• 0 to 4 weeks (breastfed): hold off until feeding is established.
• First year: sleep and settling. Offer at naps and bedtime.
• Around 12 months: move to sleep-only if it has drifted wider. This is the single highest-value change, and it is the one the ear-infection trial made.
• 12 months to 2 years: daytime use out entirely. Shrink to bedtime.
• Before the permanent front teeth: done. Most children get there on their own; the AAP notes peer pressure does a lot of the work before school age.

The 12-month and 2-year steps are our reading of the sources, not a number printed by a health authority. The two firm anchors are the AAP's 2-to-4-year line for bite changes and the Finnish trial's finding on restricting use to falling asleep.

Common mistakes when weaning

• Cold turkey during a hard week. A new sibling, a house move, the first weeks of daycare, an ear infection. Pick a dull week instead.
• Trading down to the thumb. A thumb cannot be left in a drawer. If your child is a strong sucker, taper the pacifier rather than removing it abruptly.
• Waiting for a milestone to force the issue. The pacifier is easier to retire at 14 months than at 34, and a toddler who can argue will argue.
• Counting words instead of counting hours. A 20-word 19-month-old with a sleep-only pacifier is not the same case as a silent 19-month-old with an all-day one.
• Treating teething and speech as the same problem. They overlap in timing only. If your child is chewing everything and miserable, that is teething, and a pacifier is not the villain there.

Somewhere in every house there is the emergency pacifier that lives in the door pocket of the car, furred with crumbs, produced at 4:40pm in a supermarket queue. That one is not a policy failure. It is just how weeks go.

When to seek professional help

Bring it up at the next visit. Get in touch sooner if any of the following is true:

• No clear words at all by 18 months. By that age a rough expectation is 10 to 20 words, and around two years a core vocabulary in the low hundreds plus the first two-word pairings (GOSH, NHS).
• Your child does not turn to their name or to sound from behind, or seems to hear inconsistently.
• Ear infections that keep returning.
• Strong sucking still going past three, or a dentist has flagged an open bite.
• Speech that almost nobody outside the family can understand at three.

Our when to seek help for speech delay piece has the fuller list. A hearing check comes before a pacifier debate, every time.

Frequently asked questions

Does a pacifier cause a lisp?

There is no good evidence that a pacifier causes a lisp. The one speech finding in the strongest study was a higher count of atypical errors in younger children who used a dummy frequently during the day, and those errors were not present in the older half of the sample. If a lisp persists past four, have it assessed rather than blaming the pacifier.

Is a pacifier at night bad for speech?

Night-time use was not the part associated with speech errors in the Strutt data, only daytime frequency. Sleep-time use also carries the SIDS-risk benefit the AAP describes. If you are going to keep the pacifier anywhere, keep it at sleep.

At what age should we get rid of the pacifier?

The AAP's threshold for mouth and bite changes is strong sucking past 2 to 4 years, and stopping before the permanent front teeth erupt usually lets the bite self-correct. Our practical version is sleep-only around the first birthday and fully out well before school.

Is a pacifier worse than thumb sucking?

Not clearly worse, and it has one big practical advantage: you can take it away. The Chilean survey actually found roughly three-fold odds of speech disorder for finger sucking as well as for very prolonged pacifier use. A thumb is always available, which makes it harder to retire.

My child has speech delay and uses a pacifier. Should I remove it first?

Do both, in this order: get hearing checked, cut daytime pacifier use, then see a speech-language pathologist without waiting for the pacifier change to work. Removing a pacifier is not a treatment for delay, and delay does not wait.

Does a pacifier affect vocabulary or IQ?

Some published work reports smaller vocabularies and lower later scores with intense early use, but those studies are correlational and the field is still arguing about them. Nothing there is solid enough to build a decision on. The ear-infection evidence is what a cautious parent should act on.

How KidyGrow helps you

The hard part of this decision is not the research. It is that the answer depends on your child's actual week, and nobody remembers their child's actual week.

Tell KidyGrow the pacifier now goes in for sleep only. It remembers that, and it stops giving you the generic version. Day one you might see something like "try shortening daytime pacifier use." By the second week, once it has your notes on wake windows, ear symptoms and how bedtime went, the Daily Brief reads more like "the two roughest bedtimes both followed afternoons with extra pacifier time, and both were days with a runny nose." That is the kind of link an exhausted parent cannot hold in their head across fourteen days. The app can, and that is most of the job.

It needs about three to five days of context before it says anything worth reading, and sometimes it finds nothing. Some weeks really are just a cold plus bad luck.

The change parents describe is small and specific: the morning stops starting with "was yesterday bad, or does it just feel bad?"

Sources

1. American Academy of Pediatrics, "Baby Pacifiers & Thumb Sucking: What Parents Need to Know" - healthychildren.org
2. Strutt C, Khattab G, Willoughby J. "Does the duration and frequency of dummy (pacifier) use affect the development of speech?" Int J Lang Commun Disord. 2021;56(3):512-527 - PubMed
3. Barbosa C, Vasquez S, Parada MA, et al. "The relationship of bottle feeding and other sucking behaviors with speech disorder in Patagonian preschoolers." BMC Pediatr. 2009;9:66 - PubMed
4. Niemelä M, Pihakari O, Pokka T, Uhari M. "Pacifier as a risk factor for acute otitis media: a randomized, controlled trial of parental counseling." Pediatrics. 2000;106(3):483-488 - PubMed
5. Rovers MM, Numans ME, Langenbach E, et al. "Is pacifier use a risk factor for acute otitis media? A dynamic cohort study." Fam Pract. 2008;25(4):233-236 - PubMed
6. NHS, "Looking after your baby's teeth" - nhs.uk
7. Great Ormond Street Hospital (NHS), "Speech and language development (from 12 to 24 months)" - gosh.nhs.uk