I would say it *is* possible for your body to "reset" itself. Prior to babies, I was a regular, generally 28 day kinda gal. I had my first, and I became a regular 23 day type of gal, about 2 weeks after starting my son on solids (right around 6 months postpartum--all my kids have been breastfed for over a year, no formula, solids around 5-6 months). With #2, I got my period about 2 weeks after I stopped lochia bleeding, so around 9 weeks postpartum. Again, 23 days. Same w/ #3. With #3, though, my periods were very light, with very little of the hormonal issues I was accustomed to--no ups and downs, no pimples, no cramps. Then I started her on solids and had the Period From Hell, which is what happened every other time I started up again after Baby. Now I'm back on a regular cycle, 23 days, and like I had normally--so my period "reset" itself to a shorter cycle during my childbearing years. Also, some of the hormonal things seem to have changed a bit, too, so I'd say it's entirely possible you had a very light, short period and might get it again. It's entirely normal, though, to have irregular periods while you breastfeed. I'm like clockwork, and with 2 of my kiddos, during breastfeeding I've skipped a period (hello pregnancy test!).