Nappy stockpile

So my favourite nappies are on offer at the minute so I was thinking of going and buying all my stockpile for the baby now! The size one have 44 in a pack and are for up to the size of 11lbs, my other 2 babies was both 8lb and I was wondering how many packs to buy? I can't actually remember how many I bought for my other 2 but I remember I over bought which I don't want to do this time so I was wondering if anyone had any recommendations on how many packs to buy please???