HI hun i have used bottel to fed with all mine not bcos Dh wanted to feed but bcos they were stuck in scbu, i swear buy NUK brand adn MAW more resentlyly MAW as it has the flatter shapped teat which resembles the nipple very well adn it ahs air flow vent on bottom of bottle. I belive the one's u insert a bag into reduce wind but most bottle's claim to do this these days. Avent i have hurd mixed reports on tbh hun. they leak after a fwe wks of use and even thou expensive havnt had that great reviews. Good Luck with desiding xxx