sick people are exempt from fasting on Tisha Be-Av, while pregnant and nursing women – despite the aches and pains that they experience – are not considered sick.
3. The Prohibition of Eating and the Status of Sick People and Postpartum Women
Chapter 10: The Laws of Tisha Be-Av
Sick people are exempt from fasting on Tisha Be-Av. A woman within thirty days of childbirth is considered sick.Those who are exempt from fasting should take care to eat only simple foods that they need for their health.
There are few halakhic differences between Tisha Be-Av and the minor fasts. In general, the fast of Tisha Be-Av is equivalent to the fast of Yom Kippur.
), The prophets instituted four fasts after the destruction of the First Temple, the gravest of which is Tisha Be-Av, the ninth day of the Hebrew month of Av, the day that the Temple was destroyed
Even if Shabbat Chazon falls on the eve of Tisha B’Av (Ninth of Av), or if Tisha B’Av itself coincides with Sabbath and the fast is postponed to Sunday, we eat meat, drink wine, and sing Sabbath songs as usual, for mourning is forbidden on the Sabbath.