I've read the same thing as pp. My son who is the same age is pooping less often also. It was weird when it started happening...I got so used to finding poop in every diaper!
Is your babe still having plenty of wet diapers? I think that's key too. Also, if she is spacing out between feedings, you most likely are giving her enough milk. If she weren't getting enough, she would probably want to eat more frequently. Sounds like you're doing a great job!
Carrin Mama to Sawyer 4/06 and TTC #2 I am a WAHM!