The safest infant feeding bottle on the planet! This award winning 5oz Kiki infant bottle is 100% plastic-free, environmentally progressive, and adapts to the needs of your growing child. Both the bottle and collar are crafted from safe, high grade #304 stainless steel and the Natural Vent Nipple (slow flow) is made from medical grade silicone, so you can be sure that you are truly using a 100% BPA-free and toxin-free feeding system. As your baby grows, the bottle evolves, this bottle easily converts into a sippy bottle, straw bottle or small water bottle by simply swapping the nipple out for another Pura silicone lidFeatures:SAFE: only 100% plastic-free bottle on the marketCrafted from safe, anti-bacterial, #304 stainless steel and medical grade siliconeBPA-free and will not leach toxins like plastic bottles and ringsWide neck slow flow Pura Natural Vent Nipple crafted from 100% medical grade silicone (patents pending)Internal volume markings make measuring your child's milk or other beverage a snap. Each ounce is marked and can be seen by glancing inside the bottleCompatible with wide neck nipples from Pura, ThinkBaby, BornFree, and Dr. Brown's and many othersMedical grade silicone bottle sleeveMedical grade silicone nipple coverDishwasher safe and shatterproofLifetime warranty on stainless components