Yep Bonds are alot smaller. 000's should be small enough.
I'd stick with singlets in 000's too.
Get a couple of things 0000, but not too many. They might last til around 2 months in 0000 in some things, but DD2 only lasted about 2 weeks! She was 8lb 9oz born.
000 should last a good 3 - 6 months depending on the size of the baby. Jesse is 6 months & still wears 000 shorts & a couple of tshirts, but the rest are 00's. He only really made the change to 00's at about 5 months.

So, yeah. On average 000's are the best to buy. A couple of little things if you want to, but when they grow out of them its so unfair! & they do it so fast!