Pacifiers can help soothe a colicky baby, but they’re not a cure. Sucking is one of the earliest self-soothing behaviors infants develop, and offering a pacifier during intense crying episodes gives many babies a way to calm down when nothing else seems to work. That said, colic is complex, and a pacifier is best understood as one tool in a larger toolkit rather than a standalone fix.
Why Sucking Soothes Babies
Non-nutritive sucking, the kind that happens on a pacifier rather than during feeding, is one of the first ways a newborn organizes and regulates their own state. The rhythmic, repetitive motion helps infants achieve what researchers call physiological stability: a steadier heart rate, calmer breathing, and a more settled behavioral state. This is why pacifiers are used routinely in neonatal intensive care units to calm distressed infants.
For a colicky baby who has been crying for over an hour with no identifiable cause, that calming mechanism can provide real relief. Parents who use pacifiers consistently report lower levels of negative mood in their infants compared to parents who never use them. And when researchers asked mothers why they reached for a pacifier, the most strongly endorsed reason was straightforward: “when there is nothing else that would make my baby stop crying.”
What Colic Actually Is
Colic is defined by prolonged, unexplained crying in an otherwise healthy infant. The classic benchmark, known as the “rule of three,” describes a baby who cries for at least 3 hours a day, on 3 or more days per week, for 3 or more weeks. In practice, most pediatricians don’t wait the full three weeks before discussing it with parents. Updated guidelines from 2016 simplify the picture: if your baby is under 5 months old and has recurrent, prolonged bouts of crying or fussiness that you can’t resolve, and there’s no fever, illness, or poor weight gain, that’s colic.
The cause remains frustratingly unclear. Gut discomfort, an immature digestive system, overstimulation, and temperament all play possible roles. Because no single cause has been pinpointed, no single solution works for every baby. This is why pediatricians typically recommend trying a combination of soothing strategies.
The Air-Swallowing Question
One common concern is that pacifier sucking causes babies to swallow extra air, potentially making gas and colic symptoms worse. There’s a grain of truth here. Research on newborn swallowing shows that mixed boluses of air and liquid are the most common type infants swallow, regardless of whether a pacifier is involved. Air in the stomach can contribute to gastrointestinal distention, which may trigger burping, reflux, or discomfort. However, studies measuring esophageal motility and bolus transit found that pacifier use did not significantly change how the esophagus moved or how material traveled through it. In short, babies swallow air whether or not they’re using a pacifier. If your baby seems gassier after pacifier use, more frequent burping may help.
When to Introduce a Pacifier
If you’re breastfeeding, both the American Academy of Pediatrics and the American Academy of Family Physicians recommend waiting until breastfeeding is well established before offering a pacifier. That means your milk supply is solid, latching is comfortable and consistent, and your baby is gaining weight appropriately. This typically happens within the first few weeks. If you’re formula feeding, you can introduce a pacifier whenever you’d like.
There’s also a benefit at sleep time. The AAP recommends offering a pacifier at naps and bedtime because it’s associated with a reduced risk of SIDS. If the pacifier falls out after your baby falls asleep, you don’t need to put it back in. And if your baby simply won’t take one, that’s fine too.
Choosing the Right Pacifier
Pacifiers come in three basic shapes: conventional (round, cherry-shaped), anatomical (flat on top with a drop shape), and physiological (round and slightly elongated with a thin neck, designed to mimic the breast during feeding). Research comparing these shapes found that physiological pacifiers caused fewer changes to the palate and bite alignment over time. Children using conventional or anatomical pacifiers showed greater increases in overbite and open bite compared to those using physiological designs. If your baby will be using a pacifier regularly through the colic months, a physiological shape is the better long-term choice for oral development.
Safety Basics
Before the first use, sterilize the pacifier by placing it in boiling water for five minutes and letting it cool completely. After that, washing with hot soapy water after each use is sufficient. Check for cracks or tears before every use, and replace pacifiers every two months even if they look fine. Never let a baby chew on a damaged pacifier, as pieces can break off and become a choking hazard.
Other Strategies Worth Trying
A pacifier works best as part of a rotation. Mayo Clinic recommends several approaches to try alongside or instead of a pacifier, and what works one day may not work the next:
- Swaddling: Wrapping your baby snugly in a blanket (with room for leg movement) provides the contained feeling many colicky babies respond to.
- White noise: A white noise machine, vacuum cleaner, or dryer running in a nearby room can mask stimulation and settle crying.
- Motion: Car rides, stroller walks, rocking, or an infant swing give your baby rhythmic movement that mimics being in the womb.
- Warm baths and tummy massage: Gentle pressure on the abdomen can ease gas discomfort.
- Dimming lights: Reducing visual stimulation during crying bouts helps some babies wind down faster.
Feeding adjustments can also make a difference. Holding your baby upright during bottle feeds, burping more frequently, and using curved bottles that reduce air intake are all worth trying. For formula-fed babies, a pediatrician may suggest a one-week trial of a formula with broken-down proteins. For breastfed babies, some mothers find that eliminating dairy, eggs, nuts, wheat, or gas-producing foods like cabbage and onions from their own diet reduces their baby’s symptoms.
One Risk to Keep in Mind
Prolonged, heavy pacifier use is associated with up to a three-times higher risk of middle ear infections, with continuous users at greater risk than occasional users. Since colic resolves on its own by around 4 to 5 months of age, using a pacifier during the colic window is unlikely to cause problems. But if pacifier use becomes a round-the-clock habit that extends well past infancy, ear infections become a more realistic concern.