For babies to suck is very natural. It is how they nourish and soothe themselves. When a baby is not eating, the pacifier is better to use for soothing than a finger/thumb or a toy. Pacifiers are less likely to cause a malocclusion and are usually discontinued at an earlier age than is thumb sucking. It is easier to take away a pacifier then a finger or thumb. Thumb suckers typically continue the habit until 3-5 years.
If you notice your child beginning to suck their fingers or thumbs, during the first 3 months of life, you can introduce your child to a pacifier to avoid any trauma to the gums, it's important to buy a pacifier with a nipple made of rubber do not use the soother around the clock, only when necessary in rare instances, pacifiers may cause complications, like abnormal swallowing patterns check the pacifier daily for breakage.
They do not last forever. The child could suck a "ripped" pacifier and choke on it do not hang the pacifier around your baby's neck with a string. Your baby could be accidentally strangled.
To avoid improper breathing and abnormal molding of the baby's jaws, choose a soother that resembles the natural nipple and breast.