The silicone soother with an orthodontic neck shape is designed to fit naturally into your baby's mouth. The nipple is equipped with soft, massage lumps to soothe and stimulate baby's gums. In addition, small holes on the soother's shield allow air to flow between the soother and the baby's delicate skin, reducing irritation. The pacifiers are available in a variety of colors and designs. All Nuby pacifiers are BPA-free.