Kid Kanteen Baby Bottles feature a medical-grade, silicone nipple that 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, ensuring proper placement in the mouth, and promoting correct oral development and healthy teeth. The nipple also features a double venting system, which is designed so your baby is swallowing liquid, not air, helping reduce colic and promoting healthy digestion. Available in 3 flow rates: slow, medium and fast. Sold in 2-packs. Features: Wide base and nipple shape encourages proper latch Double-venting system reduces nipple collapse and colic *Nipple made from soft, pliable, medical-grade silicone Nipple promotes proper oral development and healthy teeth *Nipple flow rates allow natural-paced and relaxed feedings Dishwasher safe Slow Flow 0-6 months Medium Flow 6+ months Fast Flow 9+ months Our Kid Kanteen stainless steel kids water bottles and baby bottles are made with safe, BPA-free materials and designed specifically for kids. We have a reusable bottle solution for babies, toddlers, little kids and big kids, designed for easy transition as kids grow up. All our classic caps fit our classic bottles, so it is easy to go from sippy to sport to leak proof loop cap. Our baby bottles can transition to snack canisters with the use of any of our wide caps.