It is permissible
to delay making up for Ramadan until Sha‘ban even without an excuse, but it is better to hasten in making up for these days. It is permissible for women who break the Sawm during Ramadan due to valid excuses, such as menstruation or postpartum period, to delay making up for the days not fasted because of sickness or general weakness that renders them unable to fast. If the period is long and Sawm is delayed for one or two years, she should hasten to make up for the missed days once she is cured and her strength is regained. If she has lost hope of restoring her ability to make up for missed days, she should feed a needy person half a Sa‘ (1 Sa` = 3 kg. Approx.) of staple food, such as barley, dates, rice, corn, or the like for each day she did not fast. If she collects all the required amounts of food and gives them to one poor person or more for the whole of Ramadan, there is nothing wrong with this.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.