unless your bub is 6lb or under you probably wont need any of the 00000. My son was 5lb and was in 00000 for maybe 6weeks then 0000 for a while.
If you have kept the tags on them its prob best to return them to get some 0000 or 000, then if bub is quiet small you may only need 1 or 2 00000 things. Honestly bub will grow out of them so quickly though!