Y pacifier is used in babies? M thinking to use fr my baby becoz my baby cries a lot for sleep is it any disadvantage of it plz let me know any pacifier

There are many disadvantages...
1- it will get hard to wean off the pacifier.
2- Proper sterilisation will be required else can cause infection.
3- can also cause tooth decay as baby will get habituated to putting pacifier in mouth and sleeping.
4- will also hamper jaw development.
Don't give pacifiers.