For your child's safety and health: Always use this product with adult supervision. Never use feeding nipples as a pacifier. Continuous and prolonged sucking of fluids will cause tooth decay. Always check food temperature before feeding. Do not use a microwave oven to heat the bottle because microwave ovens can create hot spots in milk or formula. Test the nipple by pulling on the bulb portion, and replace if nipple shows any signs of wear. Keep nipples out of direct sunlight when not in use. Wash all parts prior to use. All components of the Dr. Brown's bottle are top-rack dishwasher-safe. Do not let a child take a bottle to bed or self-feed for long periods. Allowing your child to use this product for prolonged periods separate from regular mealtimes or to go to sleep while drinking liquids, other than water, from this baby bottle may cause or contribute to early childhood tooth decay. Keep all components not in use out of the reach of children. Additional warnings and instructions inside.