I've noticed a lot of baby stores carry the wider nipples now, I'm thinking Avia makes one, and look for anything that has a "soothie" nipple on it. These are wider and more like breastfeeding, so your baby may accept them easier.

The other thing I would suggest is to make sure you have some of the formula already on the bottle's nipple before you try giving it to the baby (squeeze or upend the bottle a bit, then rub the formula around the top of the nipple. The taste may convince them to accept the strange texture more easily.

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Tigriz
Mom to Alex - 1/21/06