; There is no connection between period and formula feed or breastfeeding... BreastFeeding moms might have delay in their cycle and some don't get even for 1 year

No connection between breastfeeding and periods, not necessarily breastfeeding moms will not get periods. Some may get next cycle itself for some it might take up to 1 year also.

There is no relation between formula feed and your periods. Start of periods varies for women to women.