G.N.
Mine is two months old and she usually has only one BM per day. Sometimes she skips a day. We know that it is normal, but we still had to bring it up to the pediatrician. He told us that unless it's hard as a rock, then we should not be concerned. She's fine and there's nothing to worry about if the poop is soft.
He said that pediatricians have been taught to tell parents that the reason they don't poop as much when breastfed is because the breast milk is so full of nutrients that very little of it is wasted, if at all. So hopefully that makes you feel good! :) It certainly sounds much better than "it's normal", doesn't it? :)