we also were in the club of only 000s. got the shock of our lives when DD was born at 2.7kgs and needed 00000. had to go out and buy a whole bunch of 00000 and 0000. she was in them for quite awhile...until around the 4 month mark too.

i reckon your best bet is to pack some 000s and some 0000s. that way if bubba is a bit smaller you will be covered and if bubba is a bit bigger you'll be fine too!