A good idea is to get things in the next size up or even two (000- 00). My DD was only in 0000 for about two weeks. Also bonds clothing is usually quite small, so ask for bigger sizes.
What about things like a thermometre, nail clippers, towels, face washers....these were things I didn't think to buy for bubba.
Other bigger gifts that I really appreciated were memoribilia sort of things, like a baby/pregnancy memory book, a beautiful frame for those first photos of your pride and joy, a photo album started with photos of me through my pg, to add to when bubba was born...