מדרש אויף שמואל א 4:19

Another matter, “when a woman conceives” – that is what is written: “Who dammed the sea with doors when it burst out and emerged from the womb” (Job 38:8). Rabbi Eliezer, Rabbi Yehoshua, and Rabbi Akiva, Rabbi Eliezer says: Just as there are doors to a house, so there are doors to a woman. That is what is written: “For it did not shut the doors of my belly” (Job 3:10). Rabbi Yehoshua says: Just as there are keys [mafteḥot] to a house, the same is true of a woman. That is what is written: “God remembered Rachel, and God heeded her, and He opened [vayiftaḥ] her womb” (Genesis 30:22). Rabbi Akiva says: Just as there are hinges [tzirim] for a house, so there are hinges foe a woman. That is what is written: “She crouched and gave birth, as her pangs of labor [tzireha] overcame her” (I Samuel 4:19). “When it burst out and emerged from the womb” – it is because it arrogantly seeks to emerge.
“When I placed a cloud as its garment” (Job 38:9), this is the fetal sac. “And fog as its swaddling” (Job 38:9), this is the placenta. “I imposed My limitations upon it” (Job 38:10), these are the first three months. “And I set a bar and doors” (Job 38:10), these are the three middle months. “I said: You shall come this far and not continue” (Job 38:11), these are the final three months. “And here the foam of your waves [bigeon galekha] will be set” (Job 38:11), Rabbi Aivu said: Due to your ordure [beon gelalekha],¹⁴Several commentaries write that the text should state “Your ordure is the object of pride [bigeon gelalekha]" (Rabbi David Luria; Etz Yosef). as when this fetus emerges, it emerges covered with ordure and all kinds of fetid substances, yet everyone hugs it and kisses it, especially if it is male. That is what is written: “When a woman conceives and bears a male child.”¹⁵The point here is that one should contemplate and thank God for the entire process that begins at conception and continues until birth.

“They traveled from Beit El, and it was still some distance to arrive at Efrat, and Rachel was in childbirth, and had difficulty in her childbirth” (Genesis 35:16).
“They traveled from Beit El, and it was still some distance [kivrat]” – Rabbi Eliezer ben Yaakov said: It was at the time when the land is perforated like a sieve [kevara] and the grain [bar] is plentiful.¹⁸The end of the summer. The Rabbis say: It was when the grain [habar] is already [kevar] growing, the rainy season has passed, and the summer has not yet come.
“Rachel was in childbirth, and had difficulty in her childbirth” – there are three who encountered difficulty in childbirth and died after giving birth, and they are: Rachel, Pinḥas’s wife, and Mikhal daughter of Shaul. Rachel –“Rachel was in childbirth, and had difficulty in her childbirth.” Pinḥas’s wife – “His daughter-in-law, wife of Pinḥas…[she crouched and gave birth, as her pangs of labor overcame her]” (I Samuel 4:19). Mikhal, as it is stated: “Mikhal daughter of Saul did not have a child until the day of her death” (II Samuel 6:23). Rabbi Yehuda bar Simon said: “Until the day of her death” she did not have, but on the day of her death she had. That is what is written: “[These were the sons of David…] the sixth was Yitre’am, by Egla his wife” (I Chronicles 3:3).¹⁹Egla is understood to be another name for Mikhal. Why does it call her Egla? Rabbi Yehuda bar Simon said: Because she lowed like a calf [egla] and died.