Period cycles after childbirth

Has anyone else had irregular period cycles after giving birth? If so, how long until they become regular again? My cycles were as follows:

May-June: 21 days

June-July: 31 days

July-August 31 days

August-September: 24 days

September-October: 35 days now, still no period.

Formula feeding, and using condoms (birth control puts lumps in my breasts and I had to have them monitored for 2 years to make sure they weren’t cancerous so doctor won’t put me on birth control anymore) No concern of being pregnant, we are responsible with condoms and went 2 years with only that until we decided to conceive our baby born in April 2019.