Before kids, I had a regular 32 day cycle with a 12 day luteal phase. After kid #1, at 16 months postpartum, I jumped into a perfectly regular 35 day cycle, still having a 12 day luteal phase. After kid #2, things got really wonky, and I ranged from 28 days to 54 days. Luteal phase remained 12 days. I started taking Vitex, since we were TTC and having trouble due to the wonky hormones. My cycle then regulated (after 2 cycles of being on the Vitex) to 29 days with a 13 day luteal phase. Then I got pregnant on the 3rd cycle of Vitex.
So the short answer is: Yes, your cycle can change after kids, and it can change after each kid!
Mama to Tornado Boy (6/04), The Brute (11/06), and Mischief (05/09)... expecting
in February '15