11 months pp. I exclusively breastfed. A month after my son started sleeping through the night my period returned.

I had my first period at 7month pp and it lasted 7 days

I had mine just after 6wks pp and they have been pretty regular ever since (I’m 7mon pp) but very heavy. This month was oddly 5days late and very very heavy. The last 3 were normal (like they were before baby.)

Unpredictable. Everyone is so different.