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 lid