I think its something to do with grieving as your baby grows up. just to add a technical side to it =P

I said when DD was a few weeks old, Im happy with just her. but now I'm already thinking about when I will be pg again, I do miss being pg (i loved it). I even know my next ones nick name when its in my tummy...(only worked it out a couple of days ago =P) but yea...heres to planing more babies!