Suggestions for particular brands? Particular shape or set-ups like inserts or nipple attachment thingies? Advice on nipple flow? Do you use different types as our babies grow older? Is there a difference in bottles for formula vs. bottles for breastmilk? Are different kinds of bottle recommended to manage any conditions in our babies like reflux or nipple confusion? And what kind of accessories do we need for cleaning and/or sanitizing and/or storing bottles? Any tips on cleaning?