מדרש אויף בראשית 2:21

He said: When you deliver the Hebrew women and you look upon the birthstool [ovnayim], if it is a son you shall kill him but if it is a daughter she shall live (Exodus 1:16).
“He said: When you deliver the Hebrew women…” Why did he command to kill them by means of the midwives? It was so the Holy One blessed be He would not prosecute him, but would punish them.
“And you look upon the ovnayim,” [this is] the place through which the baby passes [as it emerges]. Alternatively, ovnayim, Rabbi Yehuda bar Simon said: The Holy One blessed be He makes a woman’s limbs hard as stones [avanim] when she is sitting on the birthstool in childbirth, as were it not so, she would die. Rabbi Pinḥas the ḥaver says in the name of Rabbi Yona, this supports Rabbi Yehuda bar Simon: Ovnayim means nothing other than a block, which is a hard object, as it is written: “I went down to the potter’s house, and behold, he was at work on the wheel [ovnayim]” (Jeremiah 18:3).³⁰This is the surface on which the potter produces his vessel.. Rabbi Ḥanin said: He provided them a clear sign: Just as the potter has one thigh here and one thigh there and the block in the middle, so too, a woman giving birth has one thigh here and one thigh there and the newborn is in the middle. Some say: When she crouches to deliver, her thighs grow cold as stones.
“If it is a son, you shall kill him.” He said to them, if it is male, kill him, and if it is female, do not kill her; rather, if she lives, she lives, and if she dies, she dies. They said to him: How will we know if it is male or if it is female? Rabbi Ḥanina said: He provided them a clear sign. If it is face down, know that he is male, as he is looking, in his mother, at the earth from which he was created. If it is face up, she is a female, as she is looking at her source, the rib, as it is stated: “He took one of his ribs” (Genesis 2:21).
The Holy One blessed be He said to him: ‘Wicked one, whoever gave this counsel is a fool. You should have killed the females. If there are no females from where will the males marry women? One woman cannot take two men, but one man can take ten women, or one hundred.’ That is: “The princes of Tzoan are but fools” (Isaiah 19:11); it is they who gave him this counsel.

The Caesar said to Rabban Gamaliel: "Your God is a thief, as it is written (Gen. 2, 21) And the Lord God caused a deep sleep … and he slept; and he took one of his ribs." "Let me answer him," said Rabban Gamaliel's daughter to him. And she said to him: "Would you give me a duces to assist me?" "Why ':" asked the Caesar. "Because," said she, "we were visited by thieves last night who stole from us a silver pitcher; however, they left a golden one instead?" And he said to her: "I would like that such thieves would come to me every day." Then said she: "Was it not bettor for Adam that one bone was taken from him, and in its stead a woman was given to him who shall serve him?" The Caesar said: "I mean, why could He not have taken it from Adam when he was awake?" She then asked him to order a piece of meat, and it was given to her. She placed it under the grate in the ashes and when roasted she took it out and offered it to him to eat. "It is repulsive to me," he remarked. Whereupon she said: "Eve would also have been repulsive to Adam should he have seen how she was formed."'

Observe that when the Holy One, blessed be He, was about to fashion Eve, He gave considerable thought to the parts of Adam’s body out of which He would create her. He said: If I create her out of a portion of his head, she will be haughty; if I fashion her from his eyes, she will be inquisitive; if I mold her out of his mouth, she will babble; from the ear, she will be an eavesdropper; from the hands, she will steal; and from the feet, she will be a gadabout. What did He do? He fashioned her out of one of Adam’s ribs, a chaste portion of the body, so that she would stay modestly at home, as it is said: And the rib which the Lord had taken (Gen. 2:22). Nevertheless, women do not lack any of these failings. He did not create her from the head of Adam lest she be haughty, nevertheless the daughters of Zion arose and were haughty, as is said: Moreover, the Lord said: Because the daughters of Zion are haughty (Isa. 3:16). He did not fashion her from his eyes lest she be inquisitive, yet Eve was inquisitive, as it is said: And the woman saw that the tree was good (Gen. 3:6). He did not mold her from his mouth lest she babble, but Leah came and babbled, as it is written: And she said unto her: “Is it a small matter that thou hast taken away my husband?” (Gen. 30:15), and it states elsewhere: And Miriam and Aaron spoke against Moses (Num. 12:1). He did not create her from the ear, lest she eavesdrop, yet Sarah did eavesdrop, as is said: And Sarah heard in the tent door (Gen. 18:10); He did not fashion her out of his hand, lest she steal, nevertheless Rachel stole the teraphim, as it is said: And Rachel stole (ibid. 31:19); He did not create her from the foot, lest she be a gadabout, but Leah came and was a gadabout, as is said: And Leah went out (ibid. 30:16), and similarly Dinah went out (ibid. 34:1).