A pacifier (American English), dummy (United Kingdom, other Commonwealth countries and Ireland), binky or soother (Canadian English), and teether (Philippine English) 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. The mouth shield and/or the handle is large enough to avoid the danger of the child choking on it or swallowing it.
Pacifiers were cited for the first time in medical literature in 1473, being described by German physician Bartholomäus Metlinger in his book Kinderbüchlein, retitled on later editions as Regiment der jungen Kinder ("A Guide on Young Children").
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. A museum curator has suggested that these substances were used as "sympathetic magic" and that the animal bone could symbolize animal strength to help the child cope with pain.
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. A writer in 1873 described a "sugar-teat" made from "a small piece of old linen" with a "spoonful of rather sandy sugar in the center of it", "gathered ... up into a little ball" with a thread tied tightly around it. Rags with foodstuffs tied inside were also given to babies in many parts of Northern Europe and elsewhere. In some places a lump of meat or fat was tied in cloth, and sometimes the rag was moistened with brandy. German-speaking areas might use Lutschbeutel, cloth wrapped around sweetened bread or maybe poppy-seeds.
Pacifiers were settling into their modern form around 1900 when the first teat, shield and handle design was patented in the US as a "baby comforter" by Manhattan pharmacist Christian W. Meinecke. Rubber had been used in flexible teethers sold as "elastic gum rings" for British babies in the mid-19th century, and also used for feeding-bottle teats. In 1902, Sears, Roebuck & Co. advertised a "new style rubber teething ring, with one hard and one soft nipple". And in 1909 someone calling herself "Auntie Pacifier" wrote to the New York Times to warn of the "menace to health" (she meant dental health) of "the persistent, and, among poorer classes, the universal sucking of a rubber nipple sold as a 'pacifier'." In England too, dummies were seen as something the "poorer classes" would use, and associated with poor hygiene. In 1914 a London doctor complained about "the dummy teat": "If it falls on the floor it is rubbed momentarily on the mother's blouse or apron, lipped by the mother and replaced in the baby's mouth."
Early pacifiers were manufactured with a choice of black, maroon or white rubber, though the white rubber of the day contained a certain amount of lead. Binky (with a y) was first used in about 1935 as a trademarked brand name for pacifiers and other baby products manufactured by the Binky Baby Products Company of New York. The brand name is currently owned by Playtex Products, LLC as a trademark in the U.S. (and a number of other countries).
It is commonly believed that pacifiers interfere with breastfeeding, by reducing milk production.[needs update] However, trials have not found any effect on duration of breastfeeding from using a pacifier. It may have clinical benefits for preterm babies, such as helping them progress from tube to bottle feeding.
Although it is commonly believed that using a pacifier will lead to dental problems, if the pacifier is used for less than around three years, it does not appear to lead to long-term damage. However, prolonged use of a pacifier or other non-nutritive sucking habit (such as finger or blanket sucking) has been found to lead to malocclusion of the teeth, that is teeth sticking out or not meeting properly when they bite together. This is a common problem and the dental (Orthodontic) treatment to correct it can take a long time and be expensive. A Cochrane Review of the evidence found that orthodontic braces or psychological intervention (such as positive or negative reinforcement) were effective in helping children stop sucking habits where that was necessary. An orthodontic brace that used a palatal crib design seems to have been more effective than a palatal arch design.
There appears to be no strong evidence that using a pacifier delays speech development by preventing babies from practicing their speaking skills.
Researchers have found that use of a pacifier is associated with a substantial reduction in the risk of SIDS (sudden infant death syndrome). They are divided over whether this association is sufficient reason to prefer pacifier use. Some argue that pacifiers should be recommended on the strength of an association, just as back sleeping was recommended on the strength of an association. Others argue that the association is not strong enough or that the mechanism is unclear.
Some parents prefer the use of a pacifier to the child sucking their thumb or fingers.
Researchers in Brazil have shown that neither "orthodontic" nor standard pacifiers prevent dental problems if children continue sucking past the age of three years.
It is commonly reported anecdotally that pacifier use among stimulant users helps reduce bruxism and thus prevents tooth damage.
The American Academy of Pediatric Dentistry's "Policy on Thumb, Finger and Pacifier Habits" says: "Most children stop sucking on thumbs, pacifiers or other objects on their own between 2 and 4 years of age. However, some children continue these habits over long periods of time. In these children, the upper front teeth may tip toward the lip or not come in properly. Frequent or intense habits over a prolonged period of time can affect the way the child's teeth bite together, as well as the growth of the jaws and bones that support the teeth."
A study of sudden infant death syndrome (SIDS) states that "It seems appropriate to stop discouraging the use of pacifiers." The authors recommend the use of pacifiers at nap time and bedtime throughout the first year of life. For breastfeeding mothers, the authors suggest waiting until breastfeeding is well established, typically for several weeks, before introducing the pacifier.
The British Dental Health Foundation recommends: "If you can, avoid using a dummy and discourage thumb sucking. With prolonged use (see Drawbacks above), these can both eventually cause problems with how the teeth grow and develop. And this may need treatment with a brace when the child gets older."
Adult-sized pacifiers, consisting of a standard baby pacifier guard but a larger, wider nipple, are used by some members of the Adult Baby community. The nipples are often referred to as NUK5s, after the NUK brand of baby pacifiers manufactured by the German company MAPA GmbH. They are sold under the name NUK Medicpro L or NUK Size 5.fg. Since the early 2010s, there has been the advent of generic, NUK-style pacifiers on eBay, which have both adult-sized silicone nipples and adult-sized face guards and rings to match.
Recent studies have also shown that pacifier use among adults may reduce or completely eliminate snoring, and can also help with anxiety and sleep.
At techno parties and raves, standard children's pacifiers are a common sight, being both used and sold there; a common side effect of entactogen and stimulant drugs, often used by rave attendees, is bruxism (grinding of the teeth), which can result in damage to the teeth, mandible, or tongue. The use of dummies, or, alternatively, chewing gum, are anecdotally claimed to help prevent this.
Prevalence of attachments to pacifiers and their psychological functions
In the late 1970s researchers dispelled the notion that pacifiers were psychologically unhealthy and aberrant. Richard H. Passman and Jane S. Halonen at the University of Wisconsin-Milwaukee traced the developmental course of attachments to pacifiers and provided norms. They found that 66% of their sample of babies who were three months old in the United States demonstrated at least some attachment, according to their mothers. At six months of age, this incidence was 40%, and at nine months it was 44%. Thereafter, the rate of attachment to pacifiers dropped precipitously until, at 24 months of age and later, it was quite rare.
These researchers also provided experimental support for what were then only anecdotal observations that pacifiers do indeed pacify babies. In an unfamiliar playroom, one-year-old infants accompanied by their pacifier evidenced more play and demonstrated less distress than did babies without them. The investigators concluded that pacifiers should be considered to be attachment objects, similar to other security objects like blankets.
Passman and Halonen  contended that the widespread occurrence of attachments to pacifiers as well as their importance as security objects should reassure parents that they are a normal part of development for a majority of infants.
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