בן נח חייב על העוברין

(22) And if men strive together, and hurt a woman with child, so that her fruit depart, and yet no harm follow, he shall be surely fined, according as the woman’s husband shall lay upon him; and he shall pay as the judges determine.

(6) A woman who was having trouble giving birth, they cut up the fetus inside her and take it out limb by limb, because her life comes before its life. If most of it had come out already they do not touch it because we do not push off one life for another.

'See, he is an Israelite, and a son of the covenant, whilst the Torah hath said, Whosoever would shed the blood of a man, [to save] that man shall his own blood be shed,19 meaning, save the blood of the pursued by the blood of the pursuer'!

[In the case of] a pregnant woman [who is in mortal danger during childbirth, she may] extend her hand and cut up [her fetus] and remove it limb by limb, for as long as it has not emerged to the world, it is not a nefesh [soul] and it is permitted to kill it and to save its mother. But if its head has emerged, one may not touch it to kill it, for it is as living offspring, and one does not set aside one nefesh for another.

(9) ... It is a negative commandment that one should not protect the life of a rodef (pursuer). For this reason, the sages ruled that in the case of a pregnant woman in a dangerous labor, it is permissible to dismember the fetus in her womb - whether with a drug or by hand because it is like a rodef pursuing her to kill her. However, once his head has emerged one may not touch him, as we do not set aside one nefesh [soul] for another, and this is the natural way of the world.