Biting the Pitum of the Esrog:[1]

Some pregnant women are accustomed bite off the Pitum of the Esrog on Hoshana Raba as a Segula for an easy birth. Some Poskim[2], however, negate this custom being that it is forbidden to taste from the Esrog until after Sukkos.

[1] Alef Hamagen 660:6; Keser Shem Tov 7:166; Chaim Ubracha 228; Nitei Gavriel Sukkos 80:8

[2] Darkei Chaim Veshalom 796 in name of Minchas Elazar 5:36