should I pre-wash all the new baby clothes? I didn't bother. I did wash all the second hand ones though.
how many baby clothes changes will I need to make per day? My hospital (public) supplied clothes so I just brought one to take him home in. Always putting a big bib on bubs will reduce how many clothes changes you will need to do. Two pieces rather than the wondersuits will reduce this too, if there's a nappy leak you only need to change the bottom.
how many baby wraps should I take? Our hospital supplied these, I just brought a bunny rug for the trip home.
do babies wear singlets under all of their clothes? In winter, yes unless you have your heating on at home all the time. The ones that snap up under the crotch are better because they don't expose baby's tummy every time you pick them up.
are baby socks fine instead of booties? Better. I found the booties fell straight off. The socks stayed on fine until he learned how to pull them off :-)
what sizes should I pack? I had a 9 ounce baby. He never fitted into 0000 so we went straight to 000.

Regarding the tops, I found it easier to wear non-buttoning tops and just pull them up. I was way too tired to undo and redo all those buttons!