all the newborn clothes that i have from my son doesnt fit bentley but the thing is that my first…

all the newborn clothes that i have from my son doesnt fit bentley but the thing is that my first son he was actually smaller then him when he was born he was just 5lbs and bentley is 6lbs and 5oz an all the clothes are big on him i really dont get it an i be putting the same outfits on him but they dont fit they are 2.big