Question: When I first began menstruating, I did not observe Sawm (Fast) during Ramadaan because I was so young. However, I made up for the missed Ramadaan fasts intermittently in order not to be noticed by anyone. Is it permissible for me to re-observe Sawm consecutively? Am I liable for Kaffaarah (expiation)? If yes, what is the amount to be paid as Kaffaarah? al-Salaamu `alaykum wa rahmatullaah wa barakaatuh (May Allaah’s Peace, Mercy, and Blessings be upon you), may Allaah preserve you.
Answer: It is sufficient for you to make up for the days of fasting you missed when you were young, even if intermittently. However, you are liable for Kaffaarah if you delayed making them up till a subsequent Ramadaan. In this case, you should feed a poor person for each day you delayed making up an amount of half a Saa` (1 Saa`=3 kg. Approx.) of the staple foodstuff… read more here.