Here at Minbie, we hear from so many despairing parents who cannot get their older, exclusively breastfed baby to take a bottle. So, it really makes our day when Minbie nipples enable those babies to feed from a bottle for the first time. It’s all thanks to our multi-award winning nipple design. Our nipples enable babies to feed with the instinctive breastfeeding motion and latch they would normally use to feed from the breast, so babies that have never taken to bottle feeding are much more likely to enjoy feeding from Minbie. Since much of human jaw development happens in the first four years, Minbie's instinctive motion supports natural development. When you buy the 9+ Months Advanced nipples, we recommend you also purchase a pack of 6+ Months Fast nipples so as to help match your baby’s feeding rate currently. If your baby is progressing from our 6+ Months Fast nipples, then the 9+ Months Advanced nipples are the next size.