Caitlin was in newborn for ages!! Size 1 ...size 2 & 3 in stock you can't go wrong but they have this offer a couple of times a year I believe so I'd say few packs of 1 ....2 if you wish!
Depends what your budge is! I spent 24 on 4 large packs (pampers active) 3 size 3's 1 size 4 ready she will defo be using the size 3s ...if that helps?!