I know you can get electric steam ones and you can get microwave ones too. What are the advantages/disadvantages for each?? As I am hoping to breastfeed, we were thinking of just buying a single bottle (travel) microwave steriliser. How practical would this be if I couldn't breastfeed and had to bottle feed? I noticed the bottles stay "sterile" for up to 24 or 48 hours if you don't open the container once it has finished. But I don't understand...if you sterilise 4 bottles...then open it up to use one bottle for a feed, does that mean that the other three bottles will need to be sterilised again?? What is the point of doing more than one bottle at a time? Or is that only beneficial if you do all the bottles at once, then fill them all immediately with forumla/breast milk and store them in the fridge? Thanks for your replies. I am really confused.