Great bottles for breastfed babies! We only used for 3 months. They’re in great condition! 1 is a slow flow (the only one we used, can tell in photos) 1 is medium flow The slow flow was used by us for 3 months as you can see normal sign of usage. But can purchase nipples through their website. Skin-soft silicone designed to stretch and pull just like a mother’s breast BPA, lead, PVC, and phthalate free to ensure only the best for your little one Anti-colic vents designed to reduce gassiness, regurgitation, and discomfort Microwave, dishwasher (top shelf), bottle warmer, and UV sterilizer safe (do not use a microwave sterilizer for your purple cleaning tool)