Question:
Dear Rabbi,
Does this fast include women? If a boy is born after a daughter, is he considered the first born (son)? I am fasting but some have questions.
Thanks!
Answer:
The Ashkenazi Custom is that it does not include a first born girl.
A boy is born after a daughter is not considered the first born, and does not have to fast. If you go to a shul and hear a siyum, you can eat from it and you will not have to fast for the rest of the day.
Best wishes
Sources:
Orach Chaim 470-1.