Ending BFing earlier with subsequent kids?

chicsub

DD is only 9 months, but right now I plan on weaning her right around 12 mo.  With DS I planned on BFing until around 19 mo. (beginning of that summer), but he self-weaned right before 15 mo.  Of course I have some guilt b/c I feel like I could be done with nursing right now since DD isn't that attached to it like DS was and I'm just done.  I know I'll at least try to hold out until 12 mo. since it will be easier and cheaper to just transition to WCM instead of doing formula.  Anybody else intentionally stop BFing earlier with subsequent kids (not b/c things weren't working out or a medical reason)?  Did you feel guilty about it?