Amaunet, I haven't read the other replies yet but I'm an exclusive breastfeeder and I have expressed before on the odd occasion so I can go to a party or dinner without my baby. Because she has only had the bottle a few times feeding her with it has been really hard: first to get her to suck from it- and keep sucking- and second she always cries after because she misses the boob comfort factor. It took us a few different teats to find one that she liked and a few practice runs to get her to actual realise the bottle was dinner, not some random thing we were putting in her mouth. I have the Medela Calma teat which was created for breastfed babies but she doesn't like it, and the cheaper generic teats are way too fast flowing for her- she is already a guzzler so she practically choked on those. We've had much more success with the Pigeon perestaltic (sp?) teat. But it will depend on your bubba. A cheap one might work wonders! if you are going formula for that night it might also be worth trying some with her beforehand just so she doesn't completely freak out on the night.