The American Academy of Pediatrics and the World Health Organization recommend that babies should be breastfed for a year or more. At Klean Kanteen, we feel breastfeeding is naturally best for babies, mothers, families, the environment and our communities. But we also understand that with working parents, daycare, busy schedules, and other situations, full-time breast feeding may not always be an option. Baby bottles are sometimes necessary to feed babies breastmilk or formula. 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.