These bottles are designed with a naturally shaped nipple with a wide mound to help your little one make a seamless switch from breast to bottle. Babies are quite active with their itty bitty hands during feeding time so a  soft, skin-like silicone material is used to offer better grip and a soothing, calming feel. The bottle features two anti-colic vents to ensure ideal air circulation to reduce unwanted colic, spit up, burping and gas.