What is the expiation for a wife who broke her fast during Ramadan due to pregnancy, then became pregnant again before completing the make-up for the days she missed?

A wife must make up for the days she missed in Ramadan. If she delays making up for them until the next Ramadan begins, and she was able to make them up, then she must offer an expiation (kaffarah) of feeding one poor person for each day. However, if she was not able to make them up, then there is no kaffarah upon her, and she is only required to make up the days. If she broke her fast solely out of fear for her fetus, then she is required to offer a ransom (fidyah) along with making up the days.