We were told since childhood that we don't have to make up the fasts missed during menstruation. I have recently got to know that we have to keep them as Qaza before next Ramadhan. What should be done for the fasts missed earlier?
Bismihi ta'ala
In these matters it is crucial to refer back to your Marja' taqleed, for the specific ruling, but from the view of A. U. Seyid Sistani, if you were confident you did not have to redo those days as qadha', you do not need to pay kaffarah, but you do need to redo those days as qadha`.
And Allah knows best.