I would plan to buy atleast 2 boxes of NB. They go through atleast 10+ a day. If you run out or need more you can always get them, maybe if you wanna buy more (espeacially when they are on special for $29 a box) buy the infant size or next size up and check with the shop u buy them from and ask if you could change them if they were too big or too small (as long as u dont open the box). Some shops are good like that and some are not.