The perfect starter bottle for baby. The Lifefactory 4oz/9oz borosilicate glass baby bottle comes with a silicone sleeve, polypropylene cap, ring, and stopper, and a Stage 1 (0-3 months) silicone nipple. These are wonderfully easy to clean: the bottle stays inside the silicone sleeve, and go right in the dishwasher. Buy a set of four and you'll have an extra in the fridge, ready for your daily routine. Made with high-quality materials and baby-friendly designs: you'll love these neat little bottles as much as your baby does!