I've read another thread similar to this and there are so many diff opinions. I've got mostly 0000's and 000's because the 5 o's are recommended for prems. However if you lie all the clothes up they all look different! Some of the 4 0's are actually bigger than the 3 0's. I think if you have a few basic in each then you should be fine and then you can always buy more or sell unused clothes on ebay!