Hii. My baby coughs milk so i panicked and ordered different brand bottles. My baby takes dr browns natural flow the best but i bought avent and tommee tippee ones and also had spectra bottles. Avent, spectra and tt have wide neck nipples and dr B has narrow neck. I think my baby is having confusion because of that. He lifts his tongue up whenever i want to feed him but when hes really really hungry, he takes it. Idk if it’s because of the nipples or what. Im pretty worried about it. Please let me know what to do. I cant stick to one bottle because baby demands milk a lot so i need bottles already ready for him.