What is the ruling on delaying the making up of missed Ramadan fasts until the following year due to breastfeeding, and is expiation (kaffarah) obligatory? If so, what is its amount?

The question involves two issues:

First: Delaying the make-up of Ramadan fasts, which is an obligation not to be performed immediately. It must be made up before the entry of the next Ramadan, unless there is a valid excuse. Whoever delays it without an excuse must make it up along with an expiation of feeding one poor person for each day.

Second: A breastfeeding woman breaking her fast. It is permissible for her to break her fast if she fears for herself or her child, by scholarly consensus. If the fear is only for herself, or for herself and her child, then she only has to make up the fasts. If the fear is only for her child, then she must make up the fasts and offer expiation by feeding, according to the majority of scholars. The feeding is incumbent upon the one responsible for the child's maintenance.