Sterifeed Sterile Baby Bottles are hygienic baby feeding bottles that are reusable and transparent, with high-quality printed graduations at every 5 ml mark which indicate how much your baby has ingested. Some vivid features of sterifeed bottles are that they fit with most breast pump fittings with a thin neck. These bottles are airtight and leak-proof, ensuring that breast milk has the longest shelf life possible whether stored in the refrigerator or freezer. These bottles are eco-friendly and recyclable, sterile - ready to use, and reusable with cold and steam sterilization. Sterifeed bottles and teats may be mixed and matched to create the optimal feeding experience for your baby!