I will be honest I got a couple of bottles just in case with lo, but expressing takes ages and it was so much easier to just breast feed, as others said there are some bottles which are meant to be easier to transition such as the breastflow bottles but if you plan to breast feed I wouldn't bother with getting loads of bottles, you create confusion if you use bottles to early any way. I had a steam steriliser and the only times I used it was when lo was ill once and doctor said to give her water and to sterilise things like tethers and even then I used to use the tablets more as then I could give all her toys a good wipe down. If you do want to express if you get an avent breast pump for example their bottles fit on to the expresser. With this lo I would not even bother with expressing. The only reason I got one in first place as dh's family were a bit funny about bf but I used to just leave the room if they were bothered as I couldn't be doing with the time it took to express with lo breast feeding as well