This pacifier is made entirely of 100% natural rubber: nipple, collar and ring. Healthy and gentle on babys face. The one-piece design allows for optimal hygiene (no joints, slits or corners). The physiological nipple allows a natural development of the palate and jaw, and its flexibility relieves babys gums. Smart, ventilation holes allow air circulation for the greatest comfort of baby. The ergonomic shape of the butterfly flange is perfectly adapted to the shape of the nose and chin. 2 sizes: 0 to 6 months or 6 to 18 months.