The dummy (pacifier or soother) is one of the most common and most debated items in infant care, generating strong opinions on both sides. The evidence on dummies is nuanced: they offer some specific benefits, carry some specific risks, and their appropriateness depends significantly on the timing of introduction, the context of feeding, and how long they are continued.
Understanding the evidence rather than adopting a strong pro- or anti-dummy position helps parents make an informed choice that fits their circumstances.
Healthbooq supports parents with balanced, evidence-based guidance on infant care practices, including the specific evidence on dummy use across the early months and years.
The Case for Dummies
The strongest evidence for dummy use is the association between dummy use during sleep and reduced risk of SIDS (Sudden Infant Death Syndrome). Multiple observational studies have found that babies who use a dummy for sleep have a lower rate of SIDS compared to those who do not. The mechanism is not fully established but may involve effects on arousal thresholds and sleep position. The Lullaby Trust previously included dummy use as a recommendation in their safer sleep guidance; their current (updated) guidance notes the association but does not actively recommend dummies as a SIDS prevention measure, in part because of concerns about the quality of evidence and the potential for other effects.
Non-nutritive sucking — sucking not associated with feeding — is a natural physiological behaviour in infants that provides comfort, reduces arousal, and supports self-regulation. A dummy meets this need in a way that can be managed and eventually removed, which some parents find preferable to the alternative (finger or thumb sucking, which cannot be managed and may be harder to stop).
The Case Against (or for Caution)
Early dummy introduction — in the first two to four weeks before breastfeeding is established — has been associated with reduced breastfeeding duration in some studies. The mechanism may be that early dummy use reduces time at the breast, reducing milk supply stimulation, or that it provides an easier feeding option that reduces the infant's motivation to work at the breast. For families who want to establish breastfeeding, delaying dummy introduction until breastfeeding is well established (typically by four to six weeks) is recommended.
Extended dummy use — particularly beyond the second year — is associated with dental effects (malocclusion, effect on arch development) and with effects on speech and language development (reduced opportunity for vocalisation and babbling when a dummy is frequently in the mouth). The American Academy of Paediatrics and UK guidance both recommend stopping by twelve to twenty-four months, with the earlier end of this range associated with less dental impact.
Practical Guidance
If a dummy is to be used, offer it at the start of a sleep period rather than throughout the day. There is no need to re-insert it when the baby drops it during sleep once they are asleep. Cleaning dummies by boiling or using a steam steriliser is appropriate; adult saliva-cleaning of a dummy (wiping the dummy with the parent's mouth) has been associated in some research with a reduced risk of allergy development in the child, which may reflect the transfer of oral microbiome diversity.
Weaning Off the Dummy
The approach to weaning from a dummy depends on the child's age and attachment. Before twelve months, simply not offering the dummy or limiting its use to sleep times is usually achievable with relative ease. By eighteen to twenty-four months, attachment to the dummy can be stronger and gradual reduction (limiting to nap time only, then removing) or a specific weaning approach (the "dummy fairy" narrative used by some families) may be more effective than abrupt removal.
Key Takeaways
Dummy use is common in the UK and is associated with some genuine benefits — including reduced SIDS risk and the meeting of a natural sucking need that supports settling — alongside some genuine risks, including an effect on breastfeeding if introduced too early and dental effects if used beyond the second year. Current guidance broadly supports offering a dummy for sleep from around four weeks (once breastfeeding is established), not forcing its use, and aiming to stop by twelve months to two years to avoid dental and speech and language effects. The association between dummy use and reduced SIDS risk is now noted but no longer actively promoted in Lullaby Trust guidance.
