Pacifiers allow babies to fulfill their natural desire to suck and also help soothe their emotions. Babies tend to breathe through their mouth so when they start weaning or talking, there is a chance of dust and infections entering their mouth. The human mouth isn’t built to filter air like the nose. This poses a risk of infections and dirt directly affecting the baby's immune system. Pacifiers assist babies to learn nasal breathing which eventually helps reduce the chances of infections.