I've went through almost 5 regular size packs of newborn & she's only 3 weeks old!! lol she's 8 pounds now. she will probably be in them atleast another week or two.

my son was in preemie diapers for two weeks (even though he was born at 38 +6 and 7 lbs 8 oz), he was in newborn for about a month after that, then he was in 1s until just about 4 days ago (he's nearly 4 months old now). it just depends on your baby really. everyone told me that I wouldn't need preemie diapers even though my son measured small throughout my pregnancy until about 35 weeks, so I never got any. I had to go to the store the day we were released from the hospital to get preemie diapers because I stocked up on newborns and didn't even use half of them. I still have 3 boxes and 7 bags full of newborn diapers, but I'm giving them to my sister since she's pregnant now.

My son is one week he is in newborn and probably will be for a few more weeks, and we've already gone through around 120 diapers

at least two boxes of newborn. my son came at 35 weeks and we had no newborn. he'll be a month old this Saturday and still in newborn

I suggest size 1 and 2 cause they grow so much the first month