The Philips Avent Natural 3.0 Feeding Bottle is designed to mimic breastfeeding with a wide nipple and soft feel. Made from heat-resistant glass, it's ideal for sterilization. Key Features Easily combine breast and bottle feeding Wide nipple with a soft feel that mimics the breast Uniquely designed opening and tip Releases milk only when baby actively drinks Baby controls the pace, just like breastfeeding Heat and thermal shock resistant glass Suitable for sterilization Key Materials: Bottle made of Borosilicate Glass; Silicone teat.Leading brand in baby care products, known for innovative feeding solutions.Before Use: Sterilize all parts by boiling or using a sterilizer. Assemble the bottle and fill with prepared milk/formula.Glass Warning: May break if dropped or subjected to extreme temperature change. Inspect before each use. Never warm milk in the microwave.