You think that a 20 week old child has no chance of living outside a womb? The current earliest premie is 21 weeks. It will only go lower with better technology. The slope slips to its logical conclusion: conception.
Here’s a thought exercise: take whatever you would consider a viable human and rewind to one developed cell earlier. Is that a human? Repeat until you can guarantee it is not a human. How far do you have to go until that is true for all instances of all fetuses? I came to the conclusion that an embryo, which can live and grow outside of a womb is the earliest logical point to consider the organism a human and make subsequent opinions accordingly.
Here’s a thought exercise: take whatever you would consider a viable human and rewind to one developed cell earlier. Is that a human? Repeat until you can guarantee it is not a human. How far do you have to go until that is true for all instances of all fetuses? I came to the conclusion that an embryo, which can live and grow outside of a womb is the earliest logical point to consider the organism a human and make subsequent opinions accordingly.