|17th of Tammuz (2)|
Halacha of the day / If one is flying from the United States to Eretz Yisroel and when he lands in Eretz Yisroel it is already night and the fast is over, although according to the place he departed the fast is still on, Rav Moshe Feinstein (Igros Moshe O.C. 3:96) and Rav Betzalel Stern (Betzel HaChocma 1:31) rule that he may end his fast (even though he will not have fasted a full day).
A woman who has given birth within the last 30 days is not required to fast and there is no need for her to be strict and fast on 17th of Tammuz. (Nitei Gavriel, Hil. Bein HaMetzorim 5:3)
Nursing mothers and pregnant women who are suffering or weak do not have to fast. A nursing mother who feels strong enough to fast, but on account of her fast the child will suffer, then the nursing mother still does not have to fast. (Ibid: 5:1,2)
Those who are permitted to eat on the 17th of Tammuz should eat in privacy and should avoid eating non-essential foods such as snack food, ice cream, etc. etc.
Those who are permitted to eat on the fast day are required to say Brochos before and after eating.