for the amount of time they are in this very small stage
and that is if you have a small baby too, i would say its not woth buying XS or size 0 but that is only me personally, with a newborn i felt glad i didnt have to bother with buying then selling on few weeks later but i am very lazy
Instaed i just used terries and so glad as you can wash out the NB poo explosions on a nice hot wash we also used size 1 LL which worked out our best value nappy as we still have them but if to buy again i would get bamboo not cotton
HTH