The BIBS Baby Bottle is made of borosilicate glass, known for its durability and heat resistance. This 225ml bottle is designed to not emit microplastics into the milk, ensuring a safe feeding experience for your baby. The round nipple is made of natural rubber latex and offers a slow flow, making it ideal for newborns. Recommended by midwives, this bottle supports natural breastfeeding. All parts are made of 100% safe food-grade material, providing peace of mind for parents.