The MAM Bottle Nipples and Anti Colic Valve Bundle includes 4 MAM fast flow and extra fast flow silicone nipples designed to resemble a mother's nipple shape to ease transition between breast and bottle, plus 2 anti colic valve replacements compatible with MAM Easy Start bottles. The innovative nipple shape is based on ultrasound observation of 16 breastfeeding infants to create a flat, symmetrical nipple that fits comfortably into baby's mouth. The nipples are made of skin-soft, BPA-free silicone that 94% of babies readily accept. They feature an air valve to prevent nipple collapse so baby can feed at their own pace. The anti colic valves work with the venting system in MAM bottles to reduce colic, gas, and reflux. The valves create a vacuum effect that eliminates bubbles that can aggravate digestive upsets. They easily place into and remove from all MAM Easy Start bottles for cleaning. With the fast and extra fast flow nipples ideal for newborns and older and the anti colic valves helping soothe digestive discomfort, this bundle contains complementary components to support healthy feeding as baby grows.