period changes after baby

I was lucky enough to not have my period for 10 months after I had my son. But when I got it last month it was pretty average/normal. This month it's pretty heavy. I was wondering if that has anything to do with my body changing after I had a baby? I used to get bad cramp, to the point where I was on the floor the most of the day, and this time they were very minor but I was severely moody 😩