I recently gave up BF and switched to formula because the BF was not a success. LO is now 5 days old (FTM), since FF I noticed that he would spit out a good amount for formula. Upon further review it looks like his tongue is gravitating towards the top of his mouth so it must be getting in the way and sending the formula back out. I'm currently using Avent naturals. I wasn't able to get him to use the Avent Soothie pacifier but he loves the NUK. Was thinking maybe if I got new bottles with a nipple like the NUK it might help. Any thoughts or similar experiences?