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I would say sentience or at least, partial sentience if that makes sense. I alreadt stated the a foetus can 'feel' from 6 weeks.
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I can only speculate as to how much more acute the philosophical question of whether others genuinely "feel" (p-zombies) becomes when discussing unborn and unfinished organisms. Though you may find that there is no argument from sentience against abortion that is not equally effective as an argument for vegetarianism.
I also point out that embryonic and foetal development is very gradual. One cannot distinguish a foetus of five weeks six days from a foetus of six weeks. Nor indeed a foetus that has almost finished growing a nervous system from one that just has. I wonder if one could even identify that point.
I am interested in how you decided that sentience should be the deciding point, regardless of whether that point can be identified (you may also wish to clarify what you mean by sentience here), as opposed to, say, the first heartbeat, the completion of the notochord, the first brainwave, or the absorption of the tail.