Is it obligatory to make up for the missed Ramadan fast due to postpartum bleeding (nifas) before the next Ramadan, or can it be postponed until after the two-year breastfeeding period? Is it permissible to give charity instead of fasting, and how much would that be in Libya?

You must make up for the Ramadan fasts you missed due to a valid excuse before the next Ramadan begins. This make-up can be done at leisure. However, if making up the fasts would harm you or your breastfeeding infant, then it is permissible to delay it until the excuse is no longer present, and there is no blame upon you. But if you delay making up the fasts without a valid excuse until the next Ramadan arrives, then you owe an expiation for your negligence, which is feeding one poor person for each day.