Nappies

I have just brought my first two packs of nappies as they were on offer at Tesco's but in all honesty I don't know if I have brought the correct ones.

They are Pampers Mini's and they state on the packet that they are ok for 6-13lbs New Born but what is the difference between these and the normal New Born nappies they also had on offer?

Everything I have brought so far seems either too small or too big. I'm not exactly sure what I'm expecting this baby to come out like and TBH its all quite scary lol