Grace was 3.5kgs when she was born and 50.5cm long. She wore a 00000 suit home - it was a summer outfit - and that is the only time she fit into that. She wore 0000 clothes for at least 6 weeks - a lot longer than I thought. In fact, the main reason that she had to move into 000 was that she was too long for the 0000. She is currently in a bit of an overlap phase, mostly 000 clothes with some 00 clothes. All-in-ones definitely require her to be in 00 as her feet are too long for 000! Everyone gave us 000, 00 or 0 as presents so we had to go and buy a heap of 0000 clothes after she was born so that she would have stuff to fit. Definitely go a size bigger in bonds stuff. I would buy most of the clothes after you child is born as then you will know what you need and not waste any money. I went nuts on neutral summer stuff in 000 as I was given the same advice not to buy 0000, it got too cold before she fitted into 000 so there is a heap of clothes that she never wore.