The claim that early-stage fetuses cannot be harmed rests on an overly narrow understanding of what harm is. Harm does not depend on whether a being can articulate its own existence or reflect on it. Newborns, for example, lack first-person self-awareness for months and do not even recognize their own bodies until well after birth, yet injuring or killing a three-month-old is universally understood as harming that child. If harm required reflective self-awareness, then many actions we clearly recognize as wrong against infants would lose their moral significance simply because the victim lacked that level of awareness.
Some try to shift the standard from self-awareness to pain, treating the capacity to feel pain as the decisive line. But history shows how unreliable such confidence can be. As recently as the 1970s and 1980s, many physicians believed infants could not feel pain, and so anesthesia or pain medication was often withheld even during invasive surgeries—a practice now widely regarded as barbaric. That error did not come from malice, but from an unchallenged assumption that turned out to be false.
This history should make us cautious about claiming certainty regarding unborn humans’ capacity for pain and then using that claim as a moral escape hatch. Even if uncertainty remains, the absence of proven pain or self-awareness does not mean the absence of harm. Ending the life of a developing human being is still a harm to that being, regardless of whether it can presently conceptualize itself or register pain in ways we confidently measure.
Key Takeaways
Harm does not require self-awareness; infants lack it yet are still clearly harmed by injury or death.
Defining harm by awareness or pain would justify actions against newborns that almost everyone agrees are wrong.
Medical history shows that confident claims about who can and cannot feel pain have been gravely mistaken before.
Uncertainty about fetal pain is not evidence of no harm; killing a developing human being is itself a serious harm.