Pigeon Silicone Pacifier Step 2 Caterpillar is ideal for babies 5 months and up. Babies have a natural need to suck so pacifiers satisfy their needs and soothe their emotions. Apart from that, pacifiers also help babies learn nasal breathing. When babies begin to wean and talk, they tend to breathe through their mouths. Unlike the nose, the mouth is not able to filter or humidify air, which means dust and infections can enter the mouth, affecting babies' immunity directly. Pacifiers thus promote natural nasal breathing, which helps to reduce the possibility of infection through mouth-breathing.