Choose the Right Shape and Size
As we mentioned earlier, a pacifier – when it is the correct shape and size – can actually aid in oral development. You should always look for an orthodontic pacifier and buy the one that is made for your baby’s age.
The age limitations noted on the packaging affect the nipple/bulb size. It creates the right amount of pressure on the palate when your baby is sucking in order to help the arch develop properly.
Again, if your baby doesn’t want to take a pacifier and they aren’t sucking their thumb, pacifiers won’t really do anything for them. But if they are sucking their thumb, a pacifier will be better for them in terms of oral development so they don’t have misaligned teeth and a narrow palate arch.