Parenting experts have long known that nonnutritive sucking, such as sucking on a finger, thumb, or pacifier , is normal behavior for most infants and young children. It used to be that parents were discouraged from letting their babies use pacifiers. The concern was that that they would interfere with breastfeeding and that prolonged use could cause speech delays and dental problems. But current American Academy of Pediatrics recommendations state that using a pacifier might be protective against sudden infant death syndrome SIDS. A study published in a issue of the British Medical Journal found that babies who used pacifiers while sleeping were significantly less likely to die of SIDS than those who did not use them, regardless of whether the infants slept on their backs or their stomachs.
Go suck on a pacifier? Adults’ mouth bacteria may help babies
Forget boiling, or antiseptic wipes: The best way to clean a Binky may be putting it in your own mouth. It may sound gross, but evidence suggests that those bacteria may help reduce instances of allergy development in babies. In a new study published in Pediatrics, researchers followed infants recruited from a Swedish hospital from birth until most of them were 3 years old. Almost all the parents of pacifier-sucking babies said they used tap water to clean the pacifier. Half of the parents said they also boiled them, and another half said they popped dirty pacifiers in their own mouth before handing them back to baby.
A pacifier American English or dummy British English and Australian English , also known as a binky , soother Canadian English , teether or Dodie is a rubber , plastic or silicone nipple given to an infant to suck upon. In its standard appearance it has a teat , mouth shield, and handle. In England in the 17th—19th centuries, a coral meant a teething toy made of coral, ivory or bone, often mounted in silver as the handle of a rattle. Pacifiers were a development of hard teething rings , but they were also a substitute for the softer sugar tits , sugar-teats or sugar-rags  which had been in use in 19th century America.