How long after having a baby did your period become regular? With my first, I didn't have a period the first year while I was breastfeeding... then once I got my period it was never regular (I think due to the BC pills I was on - I couldn't switch to find out). My 2nd is 9 months old. I got my period when he was 3 months (was hoping to go the whole year again, lol). The first cycle was 34 days, then 29, and since that one they haven't been more than 25 days (I had a 20 day cycle in April so I got a period at the beginning of the month and one at the end). I'm currently on CD 34, or 35 depending which app you look at lol, and not sure if I should wait it out...