Since you have luggage space, then must buy stuff for yourself and your bb too!
You bought your baby toiletries yet?? If not, can ask your hubby to buy Gaia Baby in Oz. It's much much cheaper compared to SG.
Also can buy Bonds clothing for the baby as well, I read that it is very comfy. The bras are also very comfy and they have a maternity/nursing range for mummy too...
EDIT - I just clicked on the bonds website and saw that they have 30% off storewide! WAH! So tempting!
http://www.bonds.com.au/