Re: showing my newbie stripes but...
At 12lbs you would use the smallest setting. You will be able to tell when to size up because the diaper will be really low on his waist.
You might have a heavy wetter on your hands. If the BGE isn't enough to hold him put a doubler in it and that should help. A bamboo or hemp doubler is best.
Wife to A
DD (07), proud surro mom (10), &
Missing my younger sister Ashley RIP 7/26/07 and our Booda RIP 5/3/09 everyday
NH's only dedicated cloth diaper retail store! All of our in stock diapers are prepped! www.petitebottoms.com