Reference: Fataawa Ramadhaan – Volume 2, Page 656, Fatwa No.660
Fataawa as-Siyaam – Page 125
Question: Whoever missed some fasts during Ramadhaan due to a[n Islaamically] valid reason, then is he required to make up the [missed] fasts consecutively, or is it permissible for him to split them up?
Response: That which is correct is that it is permissible to split them up when making them up, because the Aayah does not stipulate it be done consecutively, rather, Allaah سبحانه و تعالى has mentioned in that regard that which indicates the permissibility of making up [the missed fasts] by splitting them up.
However, that which is preferable is that they be made up consecutively, since this is the true essence behind making up [the missed fasts], because the days which were missed were consecutive, so likewise they should be made up consecutively.
