Both babies were exclusively b/f for 6 months and then their b/feeds were supplemented with food.

DS1 - AF returned 4 months after delivery - cycles ranged from 26-28 days until DS2 was conceived.
DS2 - AF returned 2.5 months after delivery - cycles ranged from 25-27 days, but in the past year have reduced down to 21-24 days!

Totally not fair, lol!