Cycle changing after baby? Advice pls!

Hi there! I’m new to this app, but I wanted to see if I’m not alone on this. I gave birth to my daughter (4th baby, 6th pregnancy) on New Years Day this year. I formula fed her from the get go so I got my period at 6 weeks pp. my cycles at first after her we’re every 29-30 days on the dot. But now they’ve become every 23-25 days. I’ve never had my cycles be so close together, it feels like a constant roller coaster of PMDD, Ovulation and Menstruation. Have any of your cycles changed after you had your babies?