Hi there. I think it is probably a good idea to have at least a couple of bottles there just in case you need them. I have an avent electric steriliser and I can fit all my bottles in it. I have an assortment of avent, pigeon and Dr Browns bottles and they all fit. Out of the bottles I have I would say the pigeon would have the most natural shape to resemble the breast and the teat kind of stretches out a little bit too which again would resemble what your nipple would do. Most bottles you buy come with the smallest teat included but just make sure for a new born you have the slowest flow or level 1 teat as the baby won't be able to handle a fast flow.