Is it permissible for a woman who broke her fast in Ramadan due to postpartum bleeding (nifas) to give charity instead of fasting because fasting is harmful to her during breastfeeding, or should she wait until the breastfeeding period ends (two years)?

Whoever breaks their fast in Ramadan due to a valid excuse must make up for the days they missed before the next Ramadan begins. If they delay making up these days without a valid excuse until the next Ramadan arrives, then they must make up the fasts and feed one poor person for each day. If fasting would harm a breastfeeding woman, she may delay making up the fasts until she weans her child, and she is not required to feed the poor.