Question: I started my monthly period when I was 12 years old and did not know at the time that I had to make up for the number of fasting days on which I had my monthly period. But even on the days on which I did not have my monthly period, I did not fast, since I did not know that fasting was obligatory on me. What is your advice for me? I want to rest my conscience as I always feel that I neglected a duty.
Answer: You must make Tawbah (repentance to Allaah) and make up for the missed days of fasting since you started your monthly period, which is a sign of puberty. Moreover, you must feed a Miskeen (a needy person) with half a Saa` (1 Saa`=3 kg. Approx.) for each delayed missed day of fasting… read more here.