C.A.
I got my period around the 4-5 month mark with all 3 of my babies. And I exclusively breastfeed for much longer with all. I do seem to remember the last one was quite a bit more irregular. I have always been on a 28 day cycle, but with this last one it has finally moved from a 35 or so back down to 28 days. And he's 14 months now. So I wouldn't be suprised if your body takes a little time to get back on track.