Is it necessary to pay the expiation for delaying the making up of Ramadan for each year separately, or is it permissible to pay it once for all the previous years?

A woman who breaks her fast out of fear for her child must make up the missed days and feed one poor person for each day. If the fear is for the fetus, there is a difference of opinion regarding whether the mother or the child's guardian is obligated to feed the poor. It is obligatory to feed one poor person for each day whose make-up was delayed without a valid excuse until the next Ramadan began. It is permissible to pay the fidyah in advance. However, the feeding (fidyah) does not multiply even if other Ramadans pass.