Fasting qadha fasts in Shawwaal
Q: I missed two days of fasting in Ramadhaan due to menstruation and I have missed 15 days of fasting from the previous Ramadhaans. In order to obtain the reward of fasting six days in Shawwal, must I make up all 17 fasts first or only two?
In addition to this I forgot to keep the intention for some of the fasts of Ramadhaan, must I make an estimate and make up these fasts? If yes then should I do this also before fasting the six days of Shawwal?