What is the connection between this Pasuk and the previous one?
Ramban: If the food, drink and the air 1 are abundant and healthy, then the women will conceive and give birth without, difficulty, nor will they be barren or have problems producing milk 2 to feed their babies. 3
Why does the Torah mention specifically women here?
Ramban #1: Because infertility is more common among women than men.
Ramban #2: Seeing as the Torah generally speaks in masculine terms, infertility in men is included in the previous phrase - "va'Hasirosi Machlah mi'Kirbecha". 1
Why does the Torah add the word "be'Artz'cha"?
Ramban: To teach us that even the animals will not be barren.
What is the significance of "Es Mispar Yamecha Amalei"?
Ramban: Concluding the blessings contained in the previous Pesukim, the Torah writes that if they will obey the angel that guides them, they will not die in war or in a plague that is caused by a change of climate, but that they will live a full life of seventy 1 or eighty years. 2
Targum Yonasan: It means that you will live your life to the full, from day to day - you will die on the same date as you were born. 5
See Ba'al ha'Turim.
Like the oil in the Menorah, that did not extinguish (See Seforno).
The mark of Tzadikim, as the Gemara states in Sotah, 13b (Peirush Yonasan).