October 9, 2026 Categories: In Print / Toras HaChaim: A New Torah Column
The Status Of A Fetus In Halacha: What is the Definition of Life? (Part I)
Let us begin our halachic discussion about the status of a fetus by asking some profound and fascinating questions about life itself:
- When does life begin?
And to answer this, we need to ask an even more basic question:
- What is the definition of life?
Is it breathing?
Is it being conscious, or having consciousness?
Is it having independent existence? (And if this is the case, then we can contemplate whether anyone has independent existence, especially if we understand Hashem as the only one with complete independent existence, as all of existence is dependent on Him. See Rambam, Ramban, and many other Rishonim who discuss this concept.)
Perhaps being alive is having free will and agency?
The only problem with these definitions is that none of them would hold up unqualified. Is someone on a breathing tube not alive, since they are dependent on a machine for their continued existence? Is someone sleeping or knocked unconscious considered dead? And if someone is unable to make decisions or assert their agency, are they not alive? So, even as we begin our discussion, it becomes evident that the nature of life and the definition of “being alive” is not clearly definable. Which leads us to our next question:
- What is the status of a fetus?
- Does it depend on how old the fetus is?
The question would then become, at what stage does this transformation of status occur, and why? Is it about taking on a physical form, having a heartbeat, becoming viable and potentially independent from its mother (which could either be the point at which a fetus can survive outside the womb, or the point at which a fetus can survive in an incubator), or some other factor?
- What is the issur of abortion?
- Are there ever cases where abortion is allowed? If so, when? And why?
- Are we allowed to sacrifice a fetus in order to save its mother’s life?
For example, during the Holocaust, the Nazis began killing all the pregnant Jewish women in the camps; thus, the following halachic question was raised: would it be muttar for the Jewish doctors to abort the fetuses of all the pregnant Jewish women in order to save the lives of these innocent women?
Similarly, there are cases where a pregnant woman is unfortunately diagnosed with cancer and would need to undergo chemotherapy to save her life. Would undergoing chemotherapy be muttar, even though it will likely cause the fetus to die? Furthermore, would directly aborting the fetus be muttar in such a case, because the pregnancy itself can cause the cancer to metastasize at a quicker rate? (See Nishmas Avraham, CM 425:1, n. 15. See also Tzitz Eliezer 9:51:3.)
- Can we violate Shabbos to save a fetus?
Analyzing the Torah Sources
In addressing the status of a fetus in halacha and the Torah’s approach to abortion, the Torah (Shemos 21:22) famously discusses a case where two men are arguing and hit a pregnant woman, causing her to miscarry:And should men quarrel and hit a pregnant woman, and she miscarries but there is no fatality, he shall surely be punished, when the woman's husband makes demands of him, and he shall give [restitution] according to the judges' [orders].The Gemara in Sanhedrin (79a) interprets this verse as referring to a case where a man intended to strike his fellow man, but instead struck the pregnant woman, causing her to miscarry. The Torah states, as the Gemara explains in Baba Kama (48b-49a), that the perpetrator needs to pay the value of the fetus to the husband.
It is interesting to note that the Torah discusses a case where an abortion is done by accident. However, if one unintentionally kills someone, the halacha is that they are sent into galus (exile), not asked to simply pay a monetary fine? Thus, if abortion were in fact an act of murder, why would an accidental abortion not be treated as an accidental murder, where the punishment is galus? This is seemingly a clear indication that the Torah does not equate abortion with murder, at least not to the same degree as murdering a full-fledged human being.
Furthermore, the Mishna in Niddah (5:3) states that once a child is a single day old, if someone kills this child, they are liable for the child’s murder.
A baby boy, even one day old… one who kills him is liable for his murder.The Gemara in Niddah (44b) goes on to explain that this is learned out from the Torah source “And he that smites any man mortally, shall be put to death.” (Vayikra 24:17). The Gemara in Niddah 44b states as follows:
The Mishna teaches: And one who kills a one-day-old baby is liable for his murder. The Gemara explains that the reason for this is as it is written: “And he who smites any man mortally shall be put to death” (Leviticus 24:17), where the phrase “any man” indicates that this verse applies in any case, even in the case of a one-day-old baby.Thus, when the Torah states "any man," it includes a child who is a single day old. Again, this would seem to imply that if one aborts a fetus, it would not be included in this category. This is exactly how the Ramban (Niddah 44b) understands this Gemara. The Ramban infers that the Gemara is specifically referring to a one-day-old-child. The Ramban states that “this does not include a fetus, since we do not refer to a fetus as a human being."
Thus, this Gemara reinforces the verse in Shemos which implies that the issur of abortion is not murder. And if the issur is not murder, then this would seem to imply that the status of a fetus changes once it is born. As such, we are still left with the question: what is the status of a fetus according to halacha?
It is interesting to note that the Gemara (Bava Kama 83a) does seem to imply that a fetus has significance as a nefesh. The Gemara states that a certain level of Hashem's presence (Shechina) only resides on Klal Yisrael when there are 22,000 Jews present. The Gemara then states that if among 21,999 people there was a pregnant woman, but she then has a miscarriage, then this miscarriage would have caused the Shechina to stop resting upon Klal Yisrael.
While one can debate the halachic significance of this Gemara, it is nevertheless a clear source that a fetus has significant status in the eyes of Torah. The question thus becomes, how does this translate in regards to halacha?
In our next article, we will continue to analyze this fascinating halachic topic.
