With DD i brought 0000 clothes and never got to use any of them she was 9 pound 6.5 (4.270kgs) so she went straight into 000 and lastest about 4 weeks in them.

DS was a little smaller 8 pound 11 (3.950kgs) and fit into a few 0000 clothes then straight into 000 hes now 9 weeks and moving into 00 for length.

Maybe grab a few 0000 clothes as they really do grow out of them really quickly. Also as someone else said bonds clothes are always smaller so grab the next size up in them.