Pacifiers for babies under 2 years of age are beneficial and can be used appropriately, while the use of pacifiers is not recommended for babies over 2 years of age. 1.Babies under 2 years old: Pacifiers can make babies feel secure and thus play a role in calming their emotions, reducing babies’ crying and lowering the infections and injuries that may be caused by finger sucking. At the same time, the pacifier can exercise the baby’s sucking and perfect the swallowing ability of the mouth. 2.2 years old and above: excessive use of soothers may affect the baby’s teeth and jaw development, resulting in malocclusion, malocclusion, lip shape abnormalities, etc. 2 years old and above the baby has developed a better ability to chew, may bite through the pacifier accidentally eat into the digestive tract, in addition to excessive use of the soother, may lead to the sucking reflex has been sustained, and thus produce dependence. Pacifiers have both advantages and disadvantages, parents should be used scientifically under the guidance of a doctor, and at the same time pay attention to the selection of the appropriate type of pacifier, the use of good disinfection and hygiene, to prevent the entry of disease from the mouth.