Related for Niddah 62:2
והיינו דאמר רב קטינא
in order that their wives should emit their semen first so that their children shall be males, Scripture attributes to them the same merit as if they had themselves caused the increase of the number of their sons and sons' sons. This explains what R. Kattina said, 'I could make all my children to be males'. Raba stated: One who desires all his children to be males should cohabit twice in succession.
Midrash Tanchuma
(Lev. 12:6:) “And when the days of her purification are fulfilled [for either a son or for a daughter, she shall bring a lamb in its first year for a burnt offering….]” Why does she bring an offering? Our masters have said, “She screams a hundred times when she sits on the birthing chair, as stated (Is. 41:24), ‘Behold you are like nothing, and your actions are less than zero.’ What is [the meaning of] ‘less than zero (me’effa)?’ There are one hundred screams (meah puot), ninety-nine for death and one for life.14Exod. R. 46:2; Lev. R. 27:7; Tanh., Lev. 8:11; PRK 9:6.h And when the pangs arrive for her, she vows that she will never favor her husband [with sexual intercourse] again. She therefore brings an offering,15Because of the impetuous oath. So Nid. 31:b. as stated (ibid.), ‘she shall bring a lamb in its first year.’”
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