comments:
Boon is the most popular silicone based option Ive seen, but more recently I believe that Dr.brown just came out with a silicone bottle as well and their narrow version does pass the triangle test. Not sure if they would work directly for the spectra but maybe there's an adapter out there. Obviously they have the 4 and 8 oz glass as well that are pretty popular and the preemie/ T flow nipples are the best ones for slower paced feeding since they really slow baby down (maybe a good thing, maybe a bad thing depending on baby and their temperament) You can also opt out of using the green thing in the middle if your baby isn't overly gassy or anything and that makes it easier to clean Edit to add: This is the link to the wide neck Dr brown silicone bottle but they have a narrow option too!