A pacifier satisfies an infant’s natural urge to suck, even when they’re not feeding. This non-nutritive sucking triggers a calming response that helps babies regulate their emotional state, manage pain, and fall asleep more easily. But the effects go well beyond soothing a fussy baby. Pacifier use during sleep has been linked to a dramatic reduction in SIDS risk, while prolonged use past toddlerhood can cause dental problems and increase ear infections.
Why Sucking Calms Babies Down
Babies are born with a strong sucking reflex that serves two purposes: getting nutrition and self-soothing. A pacifier taps into the second one. When an infant sucks without receiving milk, it activates a self-regulation mechanism that shifts them into a calmer, more organized behavioral state. Heart rate slows, breathing steadies, and fussiness drops. This is why a pacifier can settle a screaming newborn within seconds, even though no food is involved.
This reflex is strongest in the first few months of life and gradually fades. Infants also use sucking to explore their environment, which is why babies put everything in their mouths. A pacifier gives them a safe, predictable object for that purpose.
Pain Relief During Medical Procedures
Pacifiers are one of the go-to tools pediatricians use to manage pain during minor procedures like heel sticks, blood draws, and vaccinations. The American Academy of Pediatrics lists pacifiers as a key method for pain relief in newborns and infants under six months during emergency department procedures. Studies show that sucking on a pacifier reduces crying time during blood draws, with the effect being especially strong in babies younger than three months.
In some cases, a small amount of sugar water is placed on the pacifier before a procedure. The combination of sucking plus the sweet taste appears more effective than either one alone. Several studies in full-term and preterm newborns found pacifiers were actually superior to sweet solutions by themselves for reducing pain responses.
SIDS Risk Reduction During Sleep
One of the most significant benefits of pacifier use is its association with a lower risk of sudden infant death syndrome. A Kaiser Permanente study comparing 185 SIDS cases with 312 matched controls found that using a pacifier during sleep reduced a baby’s risk of SIDS by more than 90 percent. The exact mechanism isn’t fully understood, but researchers believe the pacifier may help keep the airway open, prevent the baby from rolling into a dangerous position, or promote lighter sleep that makes it easier to wake up.
This protective effect is one reason many pediatricians recommend offering a pacifier at nap time and bedtime. If your baby spits it out after falling asleep, there’s no need to put it back in.
Shorter Hospital Stays for Preterm Infants
For premature babies in the NICU, pacifiers serve a more specific medical role. Non-nutritive sucking helps preterm infants develop the oral coordination they’ll need for bottle or breast feeding. This practice has been associated with shorter hospital stays, because babies who can organize their sucking patterns tend to transition to full oral feeding faster.
The Ear Infection Connection
Pacifier use has a well-documented link to middle ear infections. Multiple studies have found that children who use pacifiers develop acute otitis media more frequently than those who don’t, particularly in daycare settings. The likely reason is that the sucking motion changes pressure in the ear canal and may help bacteria travel from the throat into the middle ear.
Both the AAP and the American Academy of Family Physicians recommend weaning children off pacifiers by 18 months specifically to prevent ear infections. If your baby is getting recurrent ear infections, limiting pacifier use is one of the first things worth trying.
Effects on Teeth and Jaw Development
Pacifiers don’t cause dental problems in the first year or two. The risk increases with duration. Children who use a pacifier beyond 36 months have significantly higher rates of anterior open bite, a condition where the front teeth don’t meet when the mouth is closed. Prolonged use can also cause a posterior crossbite, where the upper and lower back teeth don’t align properly.
The good news: an open bite caused by a pacifier will typically correct itself if the habit stops before age three. To prevent crossbite specifically, the American Academy of Pediatric Dentistry recommends discontinuing or limiting pacifier use around 18 months, when the canine teeth start coming in. Usage beyond 18 months can influence the developing shape of the jaw and palate in ways that become harder to reverse.
Timing for Breastfed Babies
If you’re breastfeeding, the AAP recommends waiting until breastfeeding is well established before introducing a pacifier. This typically takes four to six weeks. The concern is that a pacifier requires a different sucking technique than the breast, and introducing one too early could interfere with a baby learning to latch properly. Once breastfeeding is going smoothly, a pacifier is considered safe to introduce.
Keeping Pacifiers Clean
Any pacifier that hits the floor or another surface should be washed before going back in your baby’s mouth. The simplest method: soak it in hot, soapy water for a minute, rinse, and let it air dry. That’s sufficient for routine cleaning.
Full sterilization (boiling for five minutes, running through the dishwasher, or using a microwave sterilizer bag) is really only necessary for brand-new pacifiers before their first use. If you want extra reassurance, sanitizing once a week or every two weeks is reasonable. Babies with immune system conditions may need more frequent sterilization.
Safety Features to Look For
U.S. safety regulations require pacifiers to pass specific tests before they can be sold. The shield or guard must be large enough that the entire pacifier cannot fit into an infant’s mouth and block the airway. It must also have ventilation holes so the baby can still breathe if the shield presses flat against their face. The pacifier must remain in one piece after stress testing that simulates the kind of pulling and chewing a baby would do.
Never tie a pacifier around your baby’s neck or attach it with a string long enough to pose a strangulation risk. Replace pacifiers that show signs of cracking, tearing, or deterioration.
When and How to Wean
The 18-month mark is the recommended time to start weaning. By this age, the SIDS risk has dropped substantially, and continued use begins increasing the chances of ear infections and dental changes. That said, weaning doesn’t have to be abrupt.
Start by limiting the pacifier to naps and bedtime only. Offer a replacement comfort object like a stuffed animal or blanket. Some families hold a “pacifier party” where the toddler trades in their pacifiers for a new toy, giving the child some control over the transition. Praise and small rewards for pacifier-free stretches can help too. The key is recognizing that the pacifier provided genuine emotional comfort, and your child will need that feeling redirected rather than simply taken away.