Another thing to remember too is that your bubs will be born in the autumn, so the weather will be cooler by then at night, so if the 000 are a bit big, you just pop a pair of socks on over the top to keep the feet of the suit on their feet, and roll their sleeves up if it's a little long because if cost is a factor to you, then you don't want to have a heap of clothes that they grow out of in no time at all and then have to get bigger ones. And yep, people will buy you a lot of clothes as gifts, but it is usually always little outfits that aren't always practicle for everyday wear around home and in my experience they tend to buy 00 so bubs gets wear out of it for longer. Baby clothes will vary loads from brand to brand too - Bonds is quite small sizing, whereas Pumpkin Patch can be bigger. The target, and BigW brands are about the same for sizing. Personally I never brought anything smaller than 000 and I never needed to - my smallest bub was 3.85kg and only 52cm, but bonds 000 suits fitted her really well, the feet didn't hang down or anything but the target suits did, so I put socks on the feet. My biggest baby was in 000 onesies for only a week before he outgrew them.

Kim has some great advice too about putting a little money away each week because you will have all the big ticket items to buy too like a bassinette/cot, car seat, pram, change table etc (although not a necessity) and linen if you don't have anyone to get hand-me-downs from and when you start shopping around for that stuff it can be a bit daunting to see the price tags.