My little man fitted into 0000, but only just. He was 4.2kgs born. 000 was better on him, with a little room to move. I took about 4 all in ones, singlets, socks and a going home outfit. DH took home what was dirty and brought clean things as I needed it. Generally we went through 2 suits and singlets a day, with him pooing through one or so a day!
HTH!