L.E.
We did the same as Dawn by buying one of a few different bottle brands to see which one the baby would take. I always had better luck with the nipples that have a wider base. You can use the wider based bottle nipples to teach the baby to open their mouth wider for breastfeeding too. Once we found one that the baby liked we bought a set of nipples in every size. Since I was primarily breastfeeding it worked out fine to only use the one bottle, but I did want to have an extra nipple on hand in each size in case one got cracked. If it cracks near the hole, the flow becomes messy and can be too fast.