Pacifiers are, as the name implies, peacemakers. As people who are around babies day and night, we support anything that keeps babies peaceful. Preferably this should be live caregivers, but sometimes human pacifiers need a break. As with all substitute nurturing devices, this is a question of balance. When a pacifier is used in addition to nurturing, it can be a comforting tool. If it is used instead of nurturing, it is a distance-producing device. If, when your infant cries, you find yourself reaching for the plug instead of the baby, or your baby reaches for the dummy instead of the mommy, you need to reassess your parenting. You want your baby to become attached to you, not to an inanimate sub.
If your baby is bonded to his binkie, six months is a good age to stop giving it to him. He's still young enough to learn to use his thumb (or your breast), so he will not become unglued when the plug stops showing up. As you helped your baby start this habit, you can be the one to end it. Just stop putting it in his mouth to keep him quiet. Try more attachment instead. If you are breastfeeding, let your baby pacify at your breast. Some babies think breasts are just for food because they haven't been encouraged to "hang out at mom's" until they've filled their sucking needs as well as their tummies. A baby with an ever-present plug as his way of self-soothing could become addicted to always having something in his mouth. As a toddler he may not develop alternative ways to self-soothe and reconnect (he may not play quietly or ask for holding, for example). He may even be delaying or inhibiting his ability to express himself and relate socially. Once again, the plastic plug is riskier than the thumb, and the breast poses no risk at all.
What about the three-year-old who is addicted to his "paci"? Consider these tips: