Tommee Tippee Natural Start 4x Fast Flow Nipples, 6+ Months, Breast-Like for a Natural Latch, Anti-Colic Valve, Soft Silicone

I am very pleased with these nipples. they are strong and durable other nipples crack and tear my philips avent nipples had fissures those i received from S. A. church the only thing is that rhey are pricey because they are brand name. some non brand bottle names include gerber those are the cheapest bottles ever Most breast like nipples lives up to its name it is very breast like because its wide the only problem i have with these nipples they dont leak but when baby is feeding the nipple inverts and gets stuck. parent constantly has to check on it from time to pull it out. its ubout time i update my daughters supplies i had been using level 0 since she was a newborn she is 6 months now! time flies! what can i say about tommy tippee nipples? i been using them for 6 months now while using the steam sterilization method and they dont crack. The teether is a whole separate review.