Related for Niddah 62:18

(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.’”