What is the ruling on a wife making up the days she missed in the previous Ramadan due to pregnancy, and what is the ruling on making up this year's fast if she is unable to fast due to breastfeeding and work?

There is no blame on the wife for breaking her fast in Ramadan due to pregnancy or breastfeeding if she fears for herself or her infant. She must make up the days she missed. If she is unable to make up the fasts before the next Ramadan due to breastfeeding, the obligation to make them up does not fall away, and she should make them up after the next Ramadan.