Size: 5oz. Material: Glass Nipple: Level 1 wide neck (0-3 months) Bottle cover included Features: The BornFree® venting system is specially designed to reduce the vacuum build-up inside bottles that often can lead to gas, spit-up and painful colic in newborns. The BornFree® baby bottle and trainer cup range is fully interchangeable and designed to grow with your baby, making it convenient and economic at the same time. BornFree® bottles are precision-made and designed not to leak. Just remember to fit the BornFree® venting system securely on the bottle. Combines naturally with breastfeeding (inner vent controls milk flow) Top rack dishwasher safe BPA, PVC, polycarbonate and phthalate free Travel Cap (not pictured) is included Baby Bottle/Nipple Compatibility Chart