I would actually caution against this. While it is nice to be prepared with some stuff in bigger sizes you really have no idea what size your baby will be wearing each season. My DD was HUGE and has always worn a couple of sizes bigger than what I assume is average for her age. If I had tried to plan out a year I would have been so, so out of luck with mid-sized stuff. if you absolutely 'need' to get things to feel prepared then one pack (3-4 count) of white onsies in each size and a couple of the terry footed sleepers (carters) are good basics to start with.