MAM Feel Good Pure Glass premium baby bottles are made to last from shatter-resistant baby safe borosilicate glass. This temperature-resistant glass is scratch and stain resistant, free from BPA and BPS and will not absorb smells or flavors from the milk. These durable glass bottles for newborn babies are engineered to handle high heat so they can be used in a microwave or bottle warmer, cooled quickly, cleaned in the dishwasher, and sterilized, in just 5 minutes at high temperatures. Lovingly manufactured in our factory in Europe to exceed rigorous American and European safety standards, these award-winning baby bottles are trusted by parents worldwide. Every MAM Feel Good Pure Glass premium baby bottle 6 oz includes a slow flow, SkinSoft™ silicone nipple that closely mimics the natural feel of breastfeeding. This makes the Feel Good premium glass bottles ideal for breastfed babies supporting seamless transitions between breastfeeding and baby bottle feeding. Developed with medical experts the nipple has a unique shape and soft texture, encourages a familiar, comforting feeding experience, making these bottles perfect for bottles for newborn babies as well as older infants. MAM Feel Good premium glass bottles are designed to have a 94% acceptance by babies, based on years of market research and parent feedback. MAM's Anti-Colic nipples are lovingly designed to resemble a mother's nipple during breastfeeding. To achieve this, MAM observed infants breastfeeding using ultrasound technology. The result is a unique flat symmetrical shaped nipple that fits perfectly in baby's mouth and makes the switch back-and-forth between breast and bottle easy. These Anti-Colic nipples reduce gas and discomfort by letting air flow freely as your baby drinks, reducing bubbles so babies swallow less air and feed more comfortably at their own natural pace. All MAM nipples are made from silicon that is free from BPA materials for maximum safety. These nipples fit all MAM bottles and are suitable for both breast milk and formula. The MAM nipple is available in five different flow rates: 0 – extra slow flow (newborn), 1 - slow flow (0+ months), 2 - medium flow (2+ months), 3 - fast flow (4+ months), and x - extra fast flow for thicker liquids (6+ months). MAM nipples are proudly made in Europe. All MAM nipples are interchangeable, so your bottle grows with your baby from extra slow flow to extra fast flow.