Pacifiers come in a variety of colors, designs, and nipple shapes. If you’re just starting out, you’ll want to pick up a couple of different styles – maybe one with the standard round nipple and one of the “orthodontic” shapes, which have a round top and a flat bottom – to see whether your baby has any preference. You’ll find them in two sizes, one for babies up to 6 months of age and another for those 6 months and older.
Whatever size and style your baby prefers, be sure the model you buy is sturdy and cannot possibly come apart (those molded out of one piece of plastic are best), with a shield that’s 1 1/2 inches or larger, so that your baby can’t put the entire pacifier into her mouth.
The shield should have ventilation holes to allow air circulation. Without these holes, a baby’s saliva can collect behind the base, causing a skin rash or irritation.