Whether you breastfeed, use formula, or choose a combination of both, Kid Kanteen® Baby Bottles are a safe, healthy, toxin-free, environmentally friendly alternative to plastic. They allow natural-paced, relaxed feedings and promote proper digestion and development. Made from 18/8 food-grade stainless steel, free of BPA, phthalates, and other toxins. The contoured, hourglass shape is designed for small hands, and the wide mouth allows for easy cleaning, pouring and filling. The medical-grade, silicone nipple is more than 2 inches in diameter at the base and has variable thicknesses so it feels more like the real thing. As your baby sucks, the long nipple adjusts, mimicking the way a human breast reshapes during breastfeeding, promoting correct oral development and healthy teeth. The nipple also features a double venting system, helping reduce colic and promoting healthy digestion.