I guess some guidelines help...but, I never seemed to get it right.  Some of the cutest outfits went unworn!

What you need to keep in mind is that in working out quantities per size I have worked this out not based on their immediate needs but on what they will grow in and out of - ie. a summer baby may not get a lot of wear out of a bodysuit but may still fit come autumn... you see??  The 00000's on some babies are onyl any good for about 3 days, but during those 3 days you may need to change clothes a few times.  But you don't want a full wardrobe of 00000 when they could grow out of them so soon.  You can always skip the 00000 and put them in the next size up straight away...but its nice to have a couple of outifts that fit nicely when theya re first born.

I'm a bit confused about the sizing... When Jaydee was born, he was only 2.5kg, however I wouldn't have wanted anything smaller than 0000 and they only fit him for a couple of weeks.  I was quite happy to have him in rompers, (onsies) that were a larger size and he spent the majority of his time wrapped in muslin anyway, (summer baby).  I found a hat, mittens, nappy and a wrap were what we used the most, we only put the rompers on him when we went out and cute outfits were really just for show.